Answers

2014-08-06T15:56:06+08:00
Note that AX^2 - BX + C is the general formula of an quadratic equation, where B is the sum and C is the product of the roots. 1. X^2 + 4X + 3: Sum is - 7 and Product is 3. Roots: (X + 3)(X + 1), therefore, X = -1 and -3. 2. 6X^2 + 12X - 18 = 6(X^2 + 2X - 3): Sum is -2 and Product is -3. Roots: 6(X + 3)(X - 1), therefore, X = -3, 1. 3. X^2 + 4X - 21: Sum is -4 and Product is -21. Roots: (X + 7)(X - 3), therefore, X = -7, 3.
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