Question

Simplifique : A) 5x-(2x+3)² B) (x+5)²-x(x+3)

Answer 1

a) 5x-(2x+3)^2

(2x+3)^2 = 4x^2 + 12x + 9

5x - ( 4x^2 + 12x + 9) =
5x - 4x^2 -12x -9 =
-4x^2 - 7x - 9

b) (x+5)^2 -x(x+3)

(x+5)^2 = x^2 + 10x + 25

x(x+3) = x^2 + 3x

x^2 + 10x + 25 - x^2 -3x =
7x + 25