Question

(x+8.).(x-8)


(x+5).(x-5


(4x+9).(4x-9)​

Answer 1

(x+8).(x-8)=

=x^2-8x+8x-64=

=x^2-64=

x^2=64

x1=+8

x2=-8

(x+5)(x-5)=

x^2-25=

x^2=25

x1=+5

x2=-5

(4x+9)(4x-9)=

16x^2-81=

16x^2=81

x^2=81/16

x1=+9/4

x2=-9/4

Espero ter ajudado.

Answer 2

(x+8.).(x-8)

x² - 8x + 8x - 64

x² - 64

(x+5).(x-5)

x² - 5x + 5x - 25

x² - 25

(4x+9).(4x-9)

16x² - 36x + 36x - 81

16x² - 81