Question

calcule os produtos

a)(x+7).x-4)
b)(3x+4).(2x+1)
c)(x-4y).(x-y)
d)
$3 {x}^{2} - 4x - 3).(x + 1)$
e)
$( {x}^{2} - x - 1).(x - 3)$
​

Answer 1

Resposta:

a)(x+7).(x-4)

$x^{2} -4x+7x-28\\x^{2} +3x-28$

b)(3x+4).(2x+1)

$6x^{2} +3x+8x+4\\6x^{2} +11x+4$

c)(x-4y).(x-y)

$x^{2} -xy-4xy+4y^{2}\\x^{2} -5xy+4y^{2}$

d) (3x²- 4x - 3) . (x + 1)

$3x^{3}+3x^{2} -4x^{2} -4x-3x-3\\ 3x^{3} -x^{2} -7x-3$

e) (x² - x - 1) . (x - 3)

$x^{3} -3x^{2} -x^{2} +3x-x+3\\x^{3}-4x^{2} +2x+3$