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X squared + kx + 9 = (x + 3) sqaured
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X squared + kx + 9 = (x + 3) sqaured

X squared + kx + 9 = (x + 3) sqaured-example-1
User Kulgar
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x^2+kx+9=(x+3)^2\\\\x^2+kx+9=x^2+6x+9\\\\k=6

User Mmohab
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The answer is 6 because with your use the exponent youll get x^3 + 6x + 9. So the x^2 and the 9 cancel out from bothside and you you are left with kx = 6x. Now divide by x and get k = 6.
User Leguest
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