Question

a expressao (7x-1)(7x+1) e igual a ?

Answer 1

(7x-1)(7x+1) = 0
49x² + 7x - 7x - 1 = 0
49x² - 1 =0
49x² = 1
x² = $\frac{1}{49}$
x = $\frac{ \sqrt{1} }{ \sqrt{49} }$
x = $\frac{ \sqrt{1} }{7}$

Answer 2

(7x-1).(7x+1)
49x²+7x-7x-1
49x²-1