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OpenStudy (anonymous):
Which number completes the perfect square trinomial? x2 + 20x + ? a: 40 b: 100 c: 25 d: 80
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OpenStudy (alekos):
just half and square the second co-efficient
OpenStudy (anonymous):
i dont understand
Vocaloid (vocaloid):
the second coefficient is 20 (look at the second term in the equation) (20/2)^2 will give you the third term
OpenStudy (anonymous):
can someone help me understand this
OpenStudy (anonymous):
100
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OpenStudy (alekos):
you got it!
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