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What is quadratic formula to solve the equation for 2x2 - 3x - 9 0?
Wiki User
∙ 11y ago
2x2 - 3x - 9 = 0
The quadratic formula is x = [-B +- sqrt(B2-4AC)] / 2A
where the +- is a plus-or-minus sign (so there are two answers).
The variables correspond to Ax2 + Bx + C = 0 so in this case, A = 2, B = -3, and C = -9.
x = [-B +- sqrt(B2-4AC)] / 2A
x = [3 +- sqrt(9+72)] / 4
x = [3 +- sqrt(81)] / 4
x = [3 +- 9] / 4
So there are two answers:
x = (3 + 9) / 4 = 12/4 = 3
and
x = (3 - 9) / 4 = -6/4 = -3/2 or -1.5
Therefore x = -1.5, 3.
Wiki User
∙ 11y ago
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