Solve: X³⋅X²÷X⁵+X⁴ - Simplifying Complex Exponent Operations

Exponent Laws with Mixed Operations

Solve the following exercise:

X3X2:X5+X4 X^3\cdot X^2:X^5+X^4

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following expression
00:05 According to the laws of exponents when multiplying the same base with different exponents
00:08 We keep the same base and add the exponents
00:12 According to the laws of exponents when dividing the same base with different exponents
00:16 We keep the same base and subtract the exponents
00:25 Continue to solve the expression in order to reduce the exponents
00:33 Any number raised to the power of 0 equals 1
00:37 This is the simplified expression and the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

X3X2:X5+X4 X^3\cdot X^2:X^5+X^4

2

Step-by-step solution

Write the problem in an organized way using fraction notation for the first term:X3X2X5+X4 \frac{}{}\frac{X^3\cdot X^2}{X^5}+X^4

Let's continue and refer to the first term in the above sum:

X3X2X5 \frac{X^3\cdot X^2}{X^5}

Begin with the numerator, using the law of exponents for multiplying terms with identical bases:

aman=am+n a^m\cdot a^n=a^{m+n}

and we obtain the following:

X3X2X5=X3+2X5=X5X5 \frac{X^3\cdot X^2}{X^5}=\frac{X^{3+2}}{X^5}=\frac{X^5}{X^5}

Now proceed to use the law of exponents for the division between terms with identical bases:

am:an=aman=amn a^m:a^n=\frac{a^m}{a^n}=a^{m-n}

When in the first stage of the above formula we just wrote the same thing in fraction notation instead of using division (:), let's apply the law of exponents to the problem and calculate the result for the first term that we obtained above:

X5X5=X55=X0 \frac{X^5}{X^5}=X^{5-5}=X^0

Proceed to apply the law of exponents:

a0=1 a^0=1

Note that this rule is actually just the understanding that dividing a number by itself will always give the result 1. Let's return to the problem and we obtain the result of the first term in the exercise (meaning - the result of calculating the fraction) is:

X0=1 X^0=1 ,

Let's return to the complete exercise and summarize everything said so far as follows:

X3X2X5+X4=X5X5+X4=X0+X4=1+X4 \frac{X^3\cdot X^2}{X^5}+X^4=\frac{X^5}{X^5}+X^4=X^0+X^4=1+X^4

3

Final Answer

1+X4 1+X^4

Key Points to Remember

Essential concepts to master this topic
  • Rule: Apply multiplication law first: aman=am+n a^m \cdot a^n = a^{m+n}
  • Technique: Convert division to fraction notation: X3X2÷X5=X5X5 X^3 \cdot X^2 ÷ X^5 = \frac{X^5}{X^5}
  • Check: Verify X0=1 X^0 = 1 and add remaining term: 1+X4 1 + X^4

Common Mistakes

Avoid these frequent errors
  • Incorrectly applying order of operations with exponents
    Don't solve X3X2÷X5+X4 X^3 \cdot X^2 ÷ X^5 + X^4 by adding X5+X4 X^5 + X^4 first = wrong grouping! This ignores proper order of operations. Always handle multiplication and division from left to right before addition.

Practice Quiz

Test your knowledge with interactive questions

Simplify the following:

\( \frac{a^4}{a^{-6}}= \)

FAQ

Everything you need to know about this question

Why do we use fraction notation instead of the division symbol?

+

Fraction notation makes it clearer to apply exponent laws! Writing X5X5 \frac{X^5}{X^5} instead of X5÷X5 X^5 ÷ X^5 helps you see that you can use am÷an=amn a^m ÷ a^n = a^{m-n} .

What does X0 X^0 actually mean?

+

Any number (except 0) raised to the power of 0 equals 1. Think of it as dividing a number by itself: X5X5=1 \frac{X^5}{X^5} = 1 , which is the same as X55=X0=1 X^{5-5} = X^0 = 1 .

Do I multiply the X4 X^4 by anything?

+

No! The X4 X^4 is a separate term being added to the result of the division. Only the terms before the + sign are involved in the division operation.

Can I simplify 1+X4 1 + X^4 further?

+

No, this is already in simplest form. You cannot combine a constant (1) with a variable term (X4 X^4 ) unless you know the specific value of X.

What if the exponents were different numbers?

+

The same laws apply! Always use aman=am+n a^m \cdot a^n = a^{m+n} for multiplication and am÷an=amn a^m ÷ a^n = a^{m-n} for division, regardless of what m and n are.

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