Simplify the Algebraic Fraction: (x³-16x²)/(8x) Step by Step

Question

Simplify:

x316x28x \frac{x^3-16x^2}{8x}

Video Solution

Solution Steps

00:07 Let's get started by breaking it down step by step.
00:13 We'll break 3 raised to a power into a product of a factor, and then factor squared.
00:23 Next, we'll identify and mark any common factors. Nice work!
00:42 Now, let's factor out the common terms from inside the parentheses.
00:50 Great job! Let's simplify the expression by reducing what we can.
00:57 This solution works well. Let's keep going to explore more.
01:06 We'll break the power into smaller products. Keep it up!
01:18 Let's find and mark those common factors again.
01:27 We're doing great! Factor out the terms from the parentheses.
01:31 And there you have it! This is another solution to the problem.

Step-by-Step Solution

Let's simplify the given expression:

x316x28x \frac{x^3-16x^2}{8x} Remember that we can reduce complete expressions only when both the numerator and denominator are completely factored into multiplication expressions,

For this, we'll use factorization, identify that in the numerator we can factor out a common term, do this, then we'll use the exponent rule mentioned later:

x316x28xx2(x16)8xx2(x16)8x1x21(x16)8x(x16)8 \frac{x^3-16x^2}{8x} \\ \frac{x^2(x-16)}{8x} \\ \frac{x^{2}(x-16)}{8x^1} \\ \frac{x^{2-1}(x-16)}{8} \\ \downarrow\\ \boxed{\frac{x(x-16)}{8} }

In the final steps, instead of using the reduction sign, we used the exponent law:

aman=amn=amn1 \frac{a^m}{a^n}=a^{m-n}=\frac{a^{m-n}}{1} (Actually, reduction is simply the quick way to apply the mentioned exponent law, but of course - the operations are identical).

From opening the parentheses in the fraction's numerator that we got, we can identify that the correct (best) answer is answer B.

Answer

x216x8 \frac{x^2-16x}{8}