Question

Qual a forma fatorada da expressão 49x² - 1?
a) (7x+1) (7x-1)
b) x . (49x - 1)
c) (7x-1) (7x-1)
d) (7x+1) (7x+1)

Answer 1

Oie, Td Bom?!

$= 49x {}^{2} - 1$

$=7 {}^{2} x {}^{2} - 1 {}^{2}$

$= (7x) {}^{2} - 1 {}^{2}$

$= (7x - 1) \: . \: (7x + 1)$

Att. Makaveli1996