(x + 1)(x - 15) gives roots of -1 and 15, and a = 14;
(x + 5)(x - 3) gives roots of -5 and 3, and a = 2.
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Doesn't have integer roots. Quadratic formula gives roots as 3.71 and -5.38.
1 and the positive and negative square roots of 2
It is a quadratic equation in X, with two real roots.
(x - 1)(x - 11) x = 1,11
Quadratic formula gives roots as 1.53 and 10.47 (to nearest hundredth.)