Question

Expand and simply
(5x + 4)²​

Answer 1

25x^2 +40x+16

Explanation:

(5x + 4)²​

(5x+4)(5x+4)

FOIL

first 5x*5x = 25x^2

outer 5x*4 = 20x

inner 4*5x = 20x

last = 4*4 = 16

Add them together

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

Combine like terms

25x^2 +40x+16

Answer 2

`{(5x + 4)}^(2) \\ = {(5x)}^(2) + 2 * 4 * 5x + {4}^(2) \\ = 25 {x}^(2) + 40x + 16 \\ thank \: you`