Question

Express x2+ 4x - 7 in the form (x + a) - b where a and b are integers.
please help 100 points

Answer 1

(x + 2)^2 - 11.

Explanation:

f(x) = x^2 + 4x - 7

Now x^2 + 4x = (x + 2)^2 - 4 so we have:

f(x) = (x + 2)^2 - 4 - 7

f(x) = (x + 2)^2 - 11.