Context: that answer is wrong in the correct equation a=2, h=1 and k=-18

Which of the following equations represents the quadratic relation y = x2 + 4x + 6 in the form y = a(x − h)2 + k?

Context: determine the equation of a quadratic function with x intercepts of -2 and 4, that passes throught the point E(2,-16). the quadratic function needs to be in the form y=a(x-h)^2+k Answer question

Given that h2+k2=21 and hk=10, what is the value of (h−k)2?

no the quadratic function needs to be in the form. y=a(x-h)^2+k

If the L.C.M. of a and 18 is 36 and the H.C.F of a and 18 is 2, then a =