Question

How do you expand `(5x - 4)^2`?

Answer 1

`(5x-4)^2=25x^2-40x+16`

Explanation:

To expand this polynomial I used the formula:

`(a-b)^2=a^2-2ab+b^2`

In this expression `a=5x` and `b=4`

`(5x-4)^2=(5x)^2-2*(5x)*4+4^2=25x^2-40x+16`