Solve (4² + 3²) ÷ √25: Order of Operations Practice

Order of Operations with Square Roots

Calculate and indicate the answer:

(42+32):25 (4^2+3^2):\sqrt{25}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:08 Let's solve this problem together.
00:11 First, we'll work on the exponents to simplify what's inside the parentheses.
00:17 Remember, an exponent means multiplying the number by itself as many times as the power indicates.
00:23 Calculate these exponents and substitute them back into the problem.
00:30 Remember, always solve the parentheses first.
00:34 Next, we'll find the root.
00:37 And there you have it, we've found the solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Calculate and indicate the answer:

(42+32):25 (4^2+3^2):\sqrt{25}

2

Step-by-step solution

Previously mentioned in the order of operations that exponents come before multiplication and division which come before addition and subtraction (and parentheses always come before everything),

Let's calculate first the value of the expression inside the parentheses (by calculating the values of the terms with exponents inside the parentheses first) :

(42+32):25=(16+9):25=25:25=2525 (4^2+3^2):\sqrt{25} =(16+9):\sqrt{25} =25:\sqrt{25} =\frac{25}{\sqrt{25}} where in the second step we simplified the expression in parentheses, and in the next step we wrote the division as a fraction,

we'll continue and calculate the value of the square root in the denominator:

2525=255 \frac{25}{\sqrt{25}} =\frac{25}{5} and then we'll perform the division (reducing the fraction essentially):

255=5 \frac{25}{5} =5 Therefore the correct answer is answer B.

3

Final Answer

5

Key Points to Remember

Essential concepts to master this topic
  • PEMDAS Rule: Parentheses first, then exponents, then division/square roots
  • Technique: Calculate 42=16 4^2 = 16 and 32=9 3^2 = 9 before adding
  • Check: Verify 25=5 \sqrt{25} = 5 and 25÷5=5 25 ÷ 5 = 5

Common Mistakes

Avoid these frequent errors
  • Calculating division before parentheses
    Don't solve 32÷25=9÷5 3^2 ÷ \sqrt{25} = 9 ÷ 5 first = wrong answer of 17.8! This ignores the parentheses which must be calculated first. Always complete everything inside parentheses before any operations outside.

Practice Quiz

Test your knowledge with interactive questions

\( 100+5-100+5 \)

FAQ

Everything you need to know about this question

Why do I need to solve the parentheses first?

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Parentheses are the highest priority in PEMDAS! They group operations together, so (42+32) (4^2+3^2) must be completely finished before dividing by 25 \sqrt{25} .

Can I calculate the square root first since it looks simpler?

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No! Even though 25=5 \sqrt{25} = 5 is easy, you must follow PEMDAS order. Parentheses always come first, no matter how simple other parts look.

What if I forget that the colon means division?

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The colon (:) symbol means division, just like ÷ or /. So 25:25 25:\sqrt{25} is the same as 25÷25 25 ÷ \sqrt{25} or 2525 \frac{25}{\sqrt{25}} .

How do I remember the order of operations?

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Use PEMDAS: Parentheses, Exponents, Multiplication/Division (left to right), Addition/Ssubtraction (left to right). Practice with "Please Excuse My Dear Aunt Sally!"

What if my calculator gives a different answer?

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Make sure you're entering the expression correctly! Use parentheses on your calculator: (4^2 + 3^2) ÷ √25. Without proper grouping, calculators might calculate in wrong order.

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