The quadratic equation ax ^ 2 + bx + c = 0, having two roots x1 and x2, can be factorized by the formula:
ax ^ 2 + bx + c = a * (x – x1) * (x – x2);
Let a = 1, then:
1 * (x + 8) * (x – 1) = x ^ 2 + 8x – x – 8 = x ^ 2 + 7x – 8;
x ^ 2 + 7x – 8 = 0 is one of the equations that satisfy the condition of the problem.
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