Question

In Exercise,factor the expression. x^2e^x - 1/2e^x

Answer 1

Answer:

$e^x (x- \frac{\sqrt{2}}{2}) (x+\frac{\sqrt{2}}{2})$

Step-by-step explanation:

For this case we have the following expression:

$x^2 e^x - \frac{1}{2}e^x$

And we want to factorize this, the first step on this case would be taking common factor $e^x$ and we got this:

$e^x (x^2 -\frac{1}{2})$

Now we can apply this case of factorization called difference of  perfect squares:

$a^2 -b^2 = (a-b)(a+b)$

For this case $a = x , b = \frac{1}{\sqrt{2}}$

And if we apply this we got:

$e^x (x- \frac{1}{\sqrt{2}})(1+ \frac{1}{\sqrt{2}})$

Now we can rationalize the expression with the square root on the denominator like this:

$\frac{1}{\sqrt{2}} * \frac{\sqrt{2}}{\sqrt{2}} = \frac{\sqrt{2}}{2}$

And if we replace this we got:

$e^x (x- \frac{\sqrt{2}}{2}) (x+\frac{\sqrt{2}}{2})$

And that would be our final expression.