Question

a) (×+9)(×-9)
b)(m-1)(m+1)
c)(3x+5)(3x-5)
d)(2-7x)(2+7x)

Answer 1

Ola Keila

de forma geral temos

(a + b)*(a - b) = a² - b²

A) (x + 9)*(x - 9) = x² - 81

B) (m - 1)*(m + 1) = m² - 1

C) (3x + 5)*(3x - 5) = 9x² - 25

D) (2 - 7x)*(2 + 7x) = 4 - 49x²

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