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| Math Central | Quandaries & Queries |
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Question from Ashley, a student: I have to solve using the quadratic formula. And my answer should be in simplest exact form. And I can't approximate. |
Hi Ashley,
To use the quadratic formula you need the the quadratic equation in the form $a x^2 + b x + c = 0.$ To obtain this from your equation first expand both sides to get
\[x(x-3) = 5 (x+4) = x^2 - 3x = 5x + 20\]
and then subtract $5x + 20$ from both sides and simplify. Now you should be able to use the quadratic formula.
Penny
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