Question

Resolva as operações.
A) (2X + 8) (4X- 2)

B)16a²b⁶c⁷ - 8a²b⁴c⁸ : (4a²b³c)

Answer 1

Oi

A)
(2X + 8) (4X- 2)

8x² -4x+32x-16

8x²+28x-16

Com baskara

8x²+28x-16=0

a=8, b=28,c=-16

Δ=28²-4.8.(-16)
Δ=784+512
Δ=1296

x= -b +- √Δ /2.a
x= -28 +- √1296 /2.8
x= -28 +- 36 /16

x¹ = -28 + 36 = 8 / 16 = 0,5

x² = -28 - 36 = -64 /16 = -4

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b)
16a²b⁶c⁷ - 8a²b⁴c⁸ : (4a²b³c)

$\frac{256a.6b.7c - 64a.4b.8c }{16a.3b.c} = \frac{192a.2b.(-1b)}{16a.3b.c} = 12a.0,6b.(-0,3)$