Question

A= {x:x is a prime factor of 12} and B= {x:x is a solution of x^2-2x-15=0}

Answer 1

Answer:

-3

-3×-4= 12.

after putting -3 in quadratic equation we get.

(-3)^2 -2×(-3) -15 = 0

9 + 6 - 15 = 0

0 = 0. solved.