Question

Y=-3x+24x-15 in vertex form

Answer 1

Y = a(x-h)^2+k
First divide factor out -3 so Y = -3(x^2-8x+5)
Then complete the square:
Y = -3(x^2-8x+16+5-16)
Y = -3(x-4)^2+33

Answer 2

Answer: (4,-38) i think