Question

Which quadratic function has a vertex of (-2, 1)?

Answer 1

y = A(x-h)2+k where (h,k) is the vertex and A is the amplitude

For the vertex and the point (-1,-1)

y = A(-1-(-2))2+ 1 = -1

A(1)2 + 1 = -1

A = -2

y = -2(x+2)2 +1 = -2(x2+4x+4)+1 = -2x2-8x-8+1

y = -2x2-8x-7

Explanation: