Question

Complete the square to rewrite y = x2 + 4x - 1 in graphing form (y = (x-h)2 + k). Then, find the vertex of the parabola.

Answer 1

Explanation:

y = x² + 4x - 1

= (x + 2)² - 4 - 1

= (x + 2)² - 5

This is now written in vertex form, so the vertex is (-2, -5). Hope this helps!