Question

Which equation has an axis of symmetry of 2?(1 point)
Responses

y=x2+4x+8

y equals x squared plus 4 x plus 8

y=−x2+4x+8

y equals negative x squared plus 4 x plus 8

y=x2+2x+8

y equals x squared plus 2 x plus 8

y=−x2+2x+8

y equals negative x squared plus 2 x plus 8

Answer 1

Use x = -b/(2a). For y = -x^2 + 4x + 8, a = -1, b = 4 so x = -4/(2·-1) = 2.

Answer: y = −x^2 + 4x + 8.