Question

Find the axis of symmetry and vertex for the parabola y=−5x2+30x+7.

Answer 1

axis of symmetry x=3

vertex (3, 52)

Explanation:

y = -5x² + 30x + 7

x = -b/2a = -30/2(-5) = -30/-10 = 3

y = -5(3)² + 30(3) + 7

y = -45 + 90 + 7

y = 52