Question

Resolva as seguintes multiplicações:
a) 9x. (3+7x) =
b) -4y. (2y + 7y3) =
c) -8.(3y – 9z)=
d) -3ax. (3 +4x5 – 4a3) =
e) 8x2. (7x – 8x4 + 5x5) =
f) 7xy2. (3xy +7x2y6 – 9x3)=

Answer 1

Resposta:

a) 9x. (3+7x) =  9x . 3 + 9x . 7x = 27x + 63x²

b) -4y. (2y + 7y³) =  (-4y) . 2y + (-4y) . 7y³ = -8y² - 28y⁴

c) -8.(3y – 9z) =  (-8).3y + (-8).(-9z) = -24y + 72z

d) -3ax. (3 +4x⁵ – 4a³) =  (-3ax).3 + (-3ax).(4x⁵) + (-3ax).(-4a³) = -9ax - 12ax⁶ + 12a⁴x

e) 8x². (7x – 8x⁴ + 5x⁵) =  (8x²). (7x) + (8x²).(-8x⁴) +  (8x²).(5x⁵) = 56x³ - 64x⁶ + 40x7

f) 7xy². (3xy +7x²y⁶ – 9x³) = (7xy²).(3xy) + (7xy²).(7x²y⁶) +  (7xy²).(-9x³) = 21x²y³ + 49x³y8 - 63x⁴y8