Best Answer

49

Check when:-

4x2-28x+49 = 0

(2x-7)(2x-7) = 0

x = 7/2 and also x = 7/2

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Q: What value of c makes 4x2-28x plus c a perfect square?

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49

49

-12

(b/2)^2= 64

The answer will depend on what c is!If the trinomial is ax^2 + bx + c then the required value of c is (b^2)/(4a)

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What value, in place of the question mark, makes the polynomial below a perfect square trinomial?x2 + 12x+ ?

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None does, since there is no polynomial below.

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