2x2+18x = 20
2x2+18x-20 = 0
x2+9x-10 = 0
(x+10)(x-1) = 0
x = -10 or x = 1
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Using the quadratic equation formula: x = 1 or x = -10
11x = 20x +1811x-20x=18x(11-20)=18-9x=18x=-2
2x2 + 3x - 20 = (x + 4)(2x - 5).
-4x2 + 6x + 40 = 0 ∴ -2x2 + 3x + 20 = 0 ∴ -2x2 - 8x + 5x + 20 = 0 ∴ -2x(x + 4) + 5(x + 4) = 0 ∴ (5 - 2x)(x + 4) = 0 ∴ x ∈ {5/2, -4}
2x2 - 20x - 106 = 0 (20 +/- sqrt(400 + 848))/4 =(20 +/- sqrt 1248)/4 = (20 +/- 35.33)/4 = 55.33/4 or -15.33/4 = 13.83 or -3.83