deividsilva784 A)

(x + 7)^2 =

x^2 + 2.x.7 + 7^2
x^2 + 14x + 49

b)
(5x + 4)^2=
(5x)^2 + 2.5x.4 + 4^2
25x^2 + 40x + 16

c) (2x + 7)^2=
(2x^2) + 2.2x.7 + 7^2
4x^2 + 28x^2 + 49

d) (x + 8)^2=
x^2 + 2.x.8 + 8^2
x^2 + 16x + 64

e) (x+2)^2=
x^2 + 2.x.2 + 2^2
x^2 + 4x + 4

f) (x+4). ( x-3)=
x^2 -3x +4x -12
x^2 +x -12

g) (x+ 3) . (x+2) =
x^2 + 2x + 3x +6
x^2 + 5x +6

h) 2x ( x-4)=
2x^2 -8x

i) (x+ 5) x=
x^2 + 5x

j) (2x -4) .2x=
4x^2 -8x

k) (5x+4) . (x-5)=
5x^2 -25x + 4x -20
5x^2 -21x -20

l) (x+4). (x-4)= x (x +2)
x^2 -4x + 4x - 16= x^2 + 2x
x^2 -x^2 -16 -2x= 0
-16 -2x= 0

m) (3x + 4)^2 = (x+1). (x+2)

3x^2 + 2.3x.4 + 4^2 = x^2 + 2x + 1x + 2
3x^2 + 24x + 16= x^2 + 3x +2
3x^2 - x^2 + 24x - 3x + 16 -2= 0
2x^2 + 21x + 14= 0

franciscaednal40

Resposta:

m sei]

Explicação passo-a-passo: