Question 196333: What value of c makes the polynomial below a perfect square? 4x^2+28x+c what is the value of c? Please I need help!!!! Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! Just look at:
4x^2+28x
Factor out the 4:
4(x^2+7x)
4(x^2+7x+__)
Fill in blank by taking half of 7 and then square it:
4(x^2+7x+ 49/4)
4(x + 7/2)^2
.
Therefore c = 49
