What number should be added to the expression x2 + 12x to change it into a perfect square trinomial? (a.6 ( b.18 (c.12 (d.36
1 answer:
Hello :
x²+12x =x²+2(6)(x)
= x²+2(6)(x) +6²-6²
= (x-6)² -6²........ (answer : d ; 36)
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