Question

a) (x - 1)(x + 1) =
d) (x + 5)(x + 7)
e
h
g) (2y + 8x)2 =
j) (x + 7)(x + 10) =
m) (4x − 2)(4x + 6) =​

Answer 1

Respuesta:

a) (x−1)(x+1)

=(x+−1)(x+1)

=(x)(x)+(x)(1)+(−1)(x)+(−1)(1)

$= {x}^{2} + x - x - 1$

$= {x}^{2} - 1$

d) (x+5)(x+7)

=(x+5)(x+7)

=(x)(x)+(x)(7)+(5)(x)+(5)(7)

$= {x}^{2} + 7x + 5x + 35$

$= {x}^{2} + 12x + 35$

g)(2y+8x)(2)

=(2y+8x)(2)

=(2y)(2)+(8x)(2)

=16x+4y

j)(x+7)(x+10)

=(x+7)(x+10)

=(x)(x)+(x)(10)+(7)(x)+(7)(10)

$= {x}^{2} + 10x + 7x + 70$

$= {x}^{2} + 17x + 70$

m)(4x−2)(4x+6)

=(4x+−2)(4x+6)

=(4x)(4x)+(4x)(6)+(−2)(4x)+(−2)(6)

$= 76 {x}^{2} + 24x - 8x - 12$

$= 16 {x}^{2} + 16x - 12$