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OpenStudy (anonymous):
hich number completes the perfect square trinomial? x2 + 20x + ?
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OpenStudy (anonymous):
what number squared is also 20 when added together?
OpenStudy (anonymous):
x^2+20x +C = (x+a)^2 x^2+20x+C = x^2 +2a +a^2 Compare both sides 20=2a a=10 Therefore, C=a^2=10^2=100
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