Question

What value for c will make the expression a perfect square trinomial?

x2 – 7x + c

Answer 1

Remember the rule: Take HALF of the coefficient of x (which here is -7), and square your result. that's your c.

Answer 2

x^2 - 2* x* 7/2 + (7/2) ^2 [ compare with a^2 -2ab +b^2 = (a-b)^2]

Answer 3

I got 11.2 and thats not one of the options