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