alleryThe equation x^2 + 3x - 10 = 0 factors as (x + 5)(x - 2) = 0. Its solutions are
A-2 and 5
B2 and 5
C-2 and -5
D2 and -5
Answer & Solution
Correct answer: D. 2 and -5
1. A product is zero only when one factor is zero.
2. x + 5 = 0 gives x = -5 and x - 2 = 0 gives x = 2.
3. The solutions are 2 and -5; the other pairs have wrong signs.
_Source: Wikipedia, Elementary algebra, Quadratic equations_
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