The product of two linear factors yields a quadratic trinomial; and the factors of a quadratic trinomial are linear factors. Now consider the expansion of (x + a)(x + b). Coefficient of x = a + b = Sum of a and b. Independent term = ab = Product of a and b.
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Step-by-step explanation:
The product of two linear factors yields a quadratic trinomial; and the factors of a quadratic trinomial are linear factors. Now consider the expansion of (x + a)(x + b). Coefficient of x = a + b = Sum of a and b. Independent term = ab = Product of a and b.