Question

Help!! 10 points. Thank you!

Answer 1

The answer is A.

When multiplying binomials, a useful way of remembering is the FOIL method (first*first, outside*outside, inside*inside, last*last).

We can find the correct answer by working backwards, which is basically just like finding the square root of each term in this expression.

For $25x^2$ we have to find the square: $\sqrt{25x^2}$. The square root symbol and the exponent 2 basically cancel each other out, and the square root of 25 is 5.

Let's use the same method for $-9y^2$. $\sqrt{-9y^2} --> \sqrt{-9y} = 3y$. In this case, though, it will be written as -3y.

Now for $z^2$: $\sqrt{z^2} = z$

So the answer is $5x - 3yz$.

Answer 2

I believe that the proper binomials that factor this expression would be C, if not it would be B.