Question

Assinale a alternativa verdadeira:

A ( 2x + 6)² = 4x² + 24x + 12
B (4x - 5 )(4x + 5 ) = 16x² - 25
C ( 3a - 4 )² = 9a² + 24a + 16​

Answer 1

Resposta:

a)(4x+36)=16x+24x+12

40x-16x+24x+12

40x-40x+12

X=12

b)(-1)(9x)=256x-25

-9x-256x-25

-9x-231x

X=-240

c)(9a-16)=81a+24a+16

-7a=105a+16

-7a-105a+16

-98a+16

a=82