Of the following quadratic equations, which is the one whose roots are 2 and – 15 ? Choices.
A) x2 - 2x + 15 = 0
B) x2 + 15x - 2 = 0
C) x2 + 13x - 30 = 0
D) x2 - 30 = 0
E) None of these
Sol.   (c) Sum of roots = 2 – 15 = – 13   Product of roots = 2 × (– 15) = – 30   Required equation   = x2 - x(sum of roots) + product of roots = 0   =&gt; x2 + 13x - 30 = 0   Answer x2 + 13x - 30 = 0
<result>C</result>
Of the following quadratic equations, which is the one whose roots are 2 and – 15 ?