Question

a) (7a-2b)²=


b)(xy²+3)²
​

Answer 1

Explicação passo-a-passo:

a)(7a - 2b)²

(7a - 2b)(7a - 2b)

49a² - 14ab - 14ab + 4b²

= 49a² - 28ab + 4b²

b)(xy² + 3)²

(xy² + 3)(xy² + 3)

x²y⁴ + 3xy² + 3xy² + 9

= x²y⁴ + 6xy² + 9

Answer 2

a) (7a - 2b)^2 -> (7a - 2b) . (7a - 2b) -> 7a . 7a - 7a . 2b - 7a . 2b - 2b . (-2b) -> 49a^2 - 14ab - 14ab + 4b^2 = 49a^2 - 28ab + 4b^2

b) (xy^2 + 3)^2 -> (xy^2 + 3) . (xy^2+ 3) -> xy^2 . xy^2 + xy^2 . 3 + xy^2 . 3 + 3 . 3 = x^2y^4 + 6xy^2 + 9