Question

write each function in vertex form f(x) =-2x^2 =6x + 10

Answer 1

repeat the equation again, is it

f(x) = -2x^2 = 6x + 10

Answer 2

which is it? why 2 equal signs?

if you mean

y = -2 x^2 - 6 x + 10

then complete the square

-2 x^2 -6 x = y - 10

x^2 + 3x = -y/2 + 5

x^2 + 3 x + 9/4 = -y/2 +5 + 9/4

(x+3/2)^2 = -(1/2) (y -29/2)
vertex at
x = -3/2 and y = 29/2

Answer 3

yes that's the equation