compete curre chewe fonetion a) $y=x^{2}+4 x$
\(\boxed{y = (x + 2)^2 - 4}\)
Step 1 :Given the quadratic function: \(y = x^2 + 4x\)
Step 2 :Find the complete square form by adding and subtracting the square of half of the coefficient of the x term:
Step 3 :\(a = 1\)
Step 4 :\(b = 4\)
Step 5 :\(c = \frac{b}{2} = 2\)
Step 6 :\(y = (x + 2)^2 - 4\)
Step 7 :\(\boxed{y = (x + 2)^2 - 4}\)