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OpenStudy (anonymous):
The question says find the value of c that makes each trinomial a perfect square, then write it as a perfect square: x^2-20x+c. I get that you have to divide by 2 and square it, but I get confused after that :(
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OpenStudy (campbell_st):
well for a quadratic ax^2 + bx + c to be a perfect square (b/2)^2 must equal c so find half the coefficient of the middle term and square it... thats the value of c.
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