Divide all terms by -1:
3x2+x -2 = 0
(3x-2)(x+1) = 0
x = 2/3 or x = -1
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2
x2+8x = -3x2+5 4x2+8x-5 = 0 (2x+5)(2x-1) = 0 x = -5/2 or x = 1/2
3x2 + 2x = 16 ∴ 3x2 + 2x - 16 = 0 ∴ 3x2 - 6x + 8x - 16 = 0 ∴ 3x(x - 2) + 8(x - 2) = 0 ∴ (3x + 8)(x - 2) = 0 ∴ x ∈ {-8/3, 2}
3x2 + x - 2 = 0(3x - 2) (x + 1) = 0x = + 2/3x = -1
2+2=4-1=3x2=6