relic4995 relic4995

24-01-2018
Mathematics

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What value, in place of the question mark, makes the polynomial below a perfect square trinomial?x2 - 28x + ?

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tynollette tynollette

28-01-2018

to make a square, when a=1, add {(1/2) of b}²
in this case, a=1, b=-28, half of -28 is -14, (-14) squared is 196
x²-28x+196=(x-14)²

the ? is 196

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