Question

Resolva as equações:
N) -2x(-x+ 2) = 3 (2x + 1)
O) 12x + 3( x -1)= -2(x + 1) +12
P) 2(x-1)=0

Answer 1

N) -2x(-x + 2) = 3 (2x + 1)

2x² - 4x = 6x + 3
2x² - 4x - 6x - 3 = 0
2x² - 10x - 3 = 0
∆ = (-10)² - 4.(2).(-3) = 100+ 24 = 124

x = -(-10) +- √124
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2.2

x = 10 +- √124
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4

x¹ = 10 + √124/4

x² = 10 - √124/4

O) 12x + 3(x-1) = -2(x+1) + 12
12x + 3x - 3 = -2x - 2 + 12
12x + 3x + 2x = -2 + 12 + 3
17x = 13
x = 13/17

P) 2(x-1) = 0
2x - 2 = 0
2x = 2
x = 1