Q: -2x2 plus 50 equals 0

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-7

x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0

x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0

The discriminant is -199.

22 = 4

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3

-7

x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0

8 - 2x2 = x + 22 - 7Combine like terms on the right side:8 - 2x2 = x + 15Subtract 8 from each side:-2x2 = x + 7Add 2x2 to each side:0 = 2x2 + x + 7

x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0

The discriminant is 25.

The discriminant is -199.

22 = 4

2x2 + 10 = 9x 2x2 - 9x + 10 = 0 (x - 2)(2x - 5) = 0

2x2+6x-8 = 72 2x2+6x-8-72 = 0 2x2+6x-80 = 0 (2x-10)(x+8) = 0

If: 2x2-3x+1 = 0 Then: x = 1 or x = 1/2

2x2 + 10 - 9x = 0 or 2x2 - 9x + 10 = 0 So (x - 2)*(2x - 5) = 0