Maths completing square pt3 help plzWatch
The question is y=4-7x-2x^2
I got up to -2(x-7/4)^2-49/8+4=0
After simplifying this, I don't get the answer given in the maths textbook.
I got -2(x-7/4)^2-17/8=0 then *-2
Which I said the turning point would be (7/4, 17/4). This is incorrect.
The actual turning point given in the textbook is (-7/4, 81/8)
What am I missing?