Question

1. Express the following expression in the form y = a(x - h)? + k
y = - x² + 4x +1​

Answer 1

Explanation:

y = -x² + 4x + 1

factor out the leading coefficient

y = -(x² - 4x) + 1

complete the square

y = -(x² - 4x + 2²) + 2² + 1

y = -(x-2)² + 5