Question

Find the turning point of y= -2x^2 + 7x + 8

Answer 1

set the derivative equal to 0. this will give you the x-value. take that x-value and plug it into the original equation to find the y value of the turning point.

Answer 2

Can we find it using completing the square ?

Answer 3

Yes, that's also another way to do it.

y = a(x-b)^2 + d

where (b, d) is the turning point