Solve (2²-3)¹⁵ + 4² Divided by (15+2): Complex Expression Challenge

Order of Operations with Complex Exponents

Check the correct answer:

(223)15+4215+232225= \frac{(2^2-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve the following problem
00:03 Break down and calculate the powers
00:34 Always calculate the parentheses first
00:49 1 raised to any power is always equal to 1
00:54 Any number divided by itself is always equal to 1
01:00 This is the solution

Step-by-step written solution

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1

Understand the problem

Check the correct answer:

(223)15+4215+232225= \frac{(2^2-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}=

2

Step-by-step solution

This simple example illustrates the order of operations, which states that multiplication and division take precedence over addition and subtraction, and that operations within parentheses come first,

Let's say we have a fraction and a whole number (every whole number) between which a division operation takes place, meaning - we can relate to the fraction and the whole number as fractions in their simplest form, through which a division operation occurs, thus we can write the given fraction in the following form:

(223)15+4215+232225=((223)15+42):(15+2)(3222):5 \frac{(2^2-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}= \\ \downarrow\\ \big((2^2-3)^{15}+4^2\big):(15+2)-(3^2-2^2):5 We emphasize this by stating that we should relate to the fractions that are in the numerator and those in the denominator separately, as if they exist in their simplest form,

Let's return to the original fraction in question, meaning - in its given form, and simplify it, simplifying separately the different fractions that are in the numerator and those in the denominator (if simplification is needed), this is done in accordance with the order of operations mentioned above and in a systematic way,

We start with the first numerator from the left in the given fraction, noting that in this case it changes the fraction in the denominators that are in multiplication, therefore, we start with this fraction, this in accordance with the aforementioned order of operations, noting further that in this fraction in the denominators (which are in multiplication of 15) there exists a multiplication, therefore, we start calculating its numerical value in multiplication and then perform the subtraction operation that is in the denominators:

(223)15+4215+232225=(43)15+4215+232225=115+4215+232225 \frac{(2^2-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}= \\ \frac{(4-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}= \\ \frac{1^{15}+4^2}{15+2}-\frac{3^2-2^2}{5} \\ We continue with the fraction we received in the previous step and simplify the numerators and the denominators in the fraction, this is done in accordance with the order of operations mentioned above, therefore, we start calculating their numerical values in multiplication and then perform the division and subtraction operations that are in the numerators and in the denominators:

115+4215+232225=1+1617945=171755 \frac{1^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}= \\ \frac{1+16}{17}-\frac{9-4}{5}= \\ \frac{17}{17}-\frac{5}{5}\\ We continue and simplify the fraction we received in the previous step, again, in accordance with the order of operations mentioned above, therefore, we perform the division operation of the denominators, this is done systematically, and then perform the subtraction operation:

171755=1̸71̸7=11=0 \frac{17}{17}-\frac{5}{5}=\\ \frac{\not{17}}{\not{17}}-\frac{\not{5}}{\not{5}}=\\ 1-1=\\ 0

We conclude with this, the steps of simplifying the given fraction, we received that:

(223)15+4215+232225=115+4215+232225=1+1617945=0 \frac{(2^2-3)^{15}+4^2}{15+2}-\frac{3^2-2^2}{5}= \\ \frac{1^{15}+4^2}{15+2}-\frac{3^2-2^2}{5} =\\ \frac{1+16}{17}-\frac{9-4}{5}= \\ 0 Therefore, the correct answer is answer D.

3

Final Answer

0

Key Points to Remember

Essential concepts to master this topic
  • Rule: Evaluate parentheses first, then exponents, then division and subtraction
  • Technique: Calculate (223)15=(43)15=115=1 (2^2-3)^{15} = (4-3)^{15} = 1^{15} = 1 step by step
  • Check: Substitute final values: 171755=11=0 \frac{17}{17} - \frac{5}{5} = 1 - 1 = 0

Common Mistakes

Avoid these frequent errors
  • Calculating exponents before parentheses
    Don't calculate 2² first and then subtract 3 = wrong base for exponent! This violates order of operations and changes the entire calculation. Always resolve parentheses completely before applying exponents.

Practice Quiz

Test your knowledge with interactive questions

\( 20\div(4+1)-3= \)

FAQ

Everything you need to know about this question

Why does 1 raised to any power equal 1?

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Because 1 multiplied by itself any number of times always equals 1. So 115=1×1×1... 1^{15} = 1 \times 1 \times 1... (15 times) = 1. This makes our calculation much simpler!

Do I really need to calculate (2²-3)¹⁵ if it equals 1¹⁵?

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Yes, you should show the steps! First calculate 22=4 2^2 = 4 , then 43=1 4-3 = 1 , then recognize that 115=1 1^{15} = 1 . This demonstrates proper order of operations.

What if I get confused with the fraction subtraction?

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Break it into steps: simplify each fraction separately first. 1717=1 \frac{17}{17} = 1 and 55=1 \frac{5}{5} = 1 , then subtract: 11=0 1 - 1 = 0 .

How do I know which operations to do first?

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Remember PEMDAS: Parentheses, Exponents, Multiplication/Division (left to right), Addition/Subtraction (left to right). Always work inside parentheses completely before moving to exponents!

Can I use a calculator for the exponent 1¹⁵?

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You can, but it's not necessary! Since any number raised to the power of 1 equals itself, and 1 times itself any number of times equals 1, you know 115=1 1^{15} = 1 without calculating.

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