WAEC - Mathematics (1996 - No. 16)

The roots of a quadratic equation are -1/4 and 3. The quadratic equation is
4x2 - 13x - 3 = 0
4x2 - 11x - 3 = 0
4x2 + 11x - 3 = 0
3x2 - 11x - 3 = 0
3x2 - 11x + 3 = 0

Explanation

The roots of a quadratic equation are -\(\frac{1}{4}\) and 3.

The quadratic equation in x

x =  -\(\frac{1}{4}\) or 3

(x + \(\frac{1}{4}\)) = 0 or (x - 3) = 0

(x + \(\frac{1}{4}\))(x - 3) = 0

x\(^2\) - 3x + \(\frac{x}{4}\) - 3(\(\frac{1}{4}\)) = 0

x\(^2\) - \(\frac{11x}{4}\) - \(\frac{3}{4}\) = 0

multiply thru by 4

4x\(^2\) - 11x - 3 = 0

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