Question

ultilizando regras de produtos notaveis calcule a) (7a+1)(7a-1) b) (3x+2/3a)^2 c) (2+9x)^2

Answer 1

a) (7a +1)(7a - 1)
49a² - 7a + 7a - 1
49a² - 1

b) (3x + 2/3a)²
(3x + 2/3a)(3x + 2/3a)
9x² + 6/3ax + 6/3ax + 4/9a²
9x² + 2ax + 2ax + 4/9a²
9x² + 4ax + 4/9a²

c) (2 + 9x)²
(2 + 9x)(2 + 9x)
4 + 18x + 18x + 81x²
4 + 36x + 81x²

BONS ESTUDOS!