Question

Resuelve
(2x + 1) (2x - 1) =
(3x + 2) (3x - 2) =
(4x + 7) (4x - 7) =

Answer 1

a=(2x+1)(2x+−1)

=(2x)(2x)+(2x)(−1)+(1)(2x)+(1)(−1)

=4x^2−2x+2x−1

=4x^2−1

b.=(3x+2)(3x+−2)

=(3x)(3x)+(3x)(−2)+(2)(3x)+(2)(−2)

=9x^2−6x+6x−4

=9x^2−4

c.=(4x+7)(4x+−7)

=(4x)(4x)+(4x)(−7)+(7)(4x)+(7)(−7)

=16x^2−28x+28x−49

=16x^2−49

Answer 2

(2x + 1) (2x - 1) = 4x² – 1

(3x + 2) (3x - 2) = 9x² – 2

(4x + 7) (4x - 7) = 16x² – 49