Question

Multiply.
(5x + 4)(5x+4)

Answer 1

25x^2 + 40x + 16

Explanation:

(5x + 4)(5x+4) is the square of a binomial: (5x + 4)^2.

The formula for this follows: (a + b)^2 = a^2 + 2ab + b^2

So, (5x + 4)^2 = 25x^2 + 40x + 16

Answer 2

25x^2+40x+16

Explanation:

We have to distribute each term to the other terms.

Let's take the first 5x and multiply it by 5x and 4 in the second set of parentheses.

5x*5x+5x*4

25x^2+20x

Now we have to multiply the first 4 by, again, 5x and 4

4*5x+4*4

20x+16

Now we combine the two bolded expressions.

25x^2+20x+20x+16

Now we combine like terms

25x^2+40x+16

Hope this helps!