2x2 = 6x
2x2 - 6x = 0
2x (x-3) = 0
Now set each part being multiplied equal to zero separately: 2x=0 and x-3 = 0. That means x = 0, 3.
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2x2+6x-8 = 72 2x2+6x-8-72 = 0 2x2+6x-80 = 0 (2x-10)(x+8) = 0
2x2-3 = -6x-2 2x2+6x-3+2 = 0 2x2+6x-1 = 0 When factored with the help of the quadratic equation formula: (2x-0.3166247904)(x+3.1583123952) = 0 Therefore: x = 0.1583123952 and also x = -3.1583123952
2x2 + 6x - 1 = 0 (-6 +/- sqrt (36 - 8)) /4 ( -6 +/- 5.29) / 4 -1.5 +/- 1.32 -2.82 or -0.18
2x2 - 6x - 25 = 0. Solutions are 5.34 and -2.34
2x2-6x+2y+18 = 0. Subtract the 2y from both sides. 2x2-6x+18 = -2y. Divide all by -2 to get y by itself. -x2+3x-9 = y. This graph is going to be a parabola that opens downward, like a frown.