SOLUTION: What number goes under the radical when solving this equation with the quadratic formula?
2x^2 - 4x - 30 = 0
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Question 1204368: What number goes under the radical when solving this equation with the quadratic formula?
2x^2 - 4x - 30 = 0
Found 3 solutions by mananth, josgarithmetic, ikleyn:
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
2x^2 - 4x - 30 = 0
comparing with ax^2+bx+c
a=2 , b=-4,c=-30
b^2-4ac is the discriminant
Plug a b c
(-4)^2-(4)(2)(-30)
16+240= 256
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Your question is asking for expression.
Your specific example is and you may compute this.
(The discriminant)
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.
On solving quadratic equations using the quadratic formula, see the lessons
- Introduction into Quadratic Equations
- PROOF of quadratic formula by completing the square
in this site.
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