Question

Valor 20 pontos (RESPOSTA COM A CONTA COMPLETA)
1)Calcule o produto:
a)-2a(x+4)

b)2x(3x+4y-2)

c)(x+5).(x²+2x-10)

d)(x+1).(x²+2x-1)

e)(x+7).(x+3)

CONTA COMPLETA PFVR

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Answer 1

Explicação passo-a-passo:

a)-2a(x+4)

(-2a.x)+(-2a.4)

-2ax-8a

b)2x(3x+4y-2)

(2x.3x)+(2x.4y)-(2x.2)

6x²+8xy-4x

c)(x+5).(x²+2x-10)

(x.x²)+(x.2x)-(x.10)+(5.x²)+(5.2x)-(5.10)

x^3+2x²-10x+5x²+10x-50

x^3+7x²-50

obs:^significa elevado

d)(x+1).(x²+2x-1)

(x.x²)+(x.2x)-(x.1)+(1.x²)+(1.2x)-(1.1)

x^3+2x²-x+x²+2x-1

x^3+x²+x-1

e)(x+7).(x+3)

(x.x)+(x.3)+(7.x)+(7.3)

x²+3x+7x+21

x²+10x+21