Question

7)Calcule: a) (3x – 2y)² = b)(2x – b)² = c)(5x² - 1)² = d)(x² - 1)² = e) (9x² - 1)² =

Answer 1

Resposta:

a) (3x – 2y)²

$9 {x}^{2} - 12xy + 4 {y}^{2}$

b)(2x – b)²

$4 {x}^{2} - 4bx + {b}^{2}$

c)(5x² - 1)²

$25 {x}^{4} - 10 {x}^{2} + 1$

d)(x² - 1)²

${x}^{4} - 2 {x}^{2} + 1$

e) (9x² - 1)²

$81 {x}^{4} - 18 {x}^{2} + 1$