what value in place of the question mark makes the polynomial below a perfect square trinomial 9x^2+?x+49
Question
Answer:
hello : 9x²+ bx +49 = (3x)² +2(3x)(7) +7²
so : b = 42
9x²+42x+49 = ( 3x+7)²....( perfect square trinomial)
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11 months ago
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