Question

What is the domain and range of the quadratic equation y = –2x2 – 32x – 126?

just need the range please

Answer 1

didnt we just do this?
the graph of this is a parabola with a maximum value of 2
you can find this maximum by either completing the square or using calculus (differentiating)

Answer 2

sorry i meant What is the domain and range of the quadratic equation y = (x – 5)2 + 10?

Answer 3

do you need any help on how to do this?

Answer 4

no just the range

Answer 5

oh ok

the graph of this is a parabola which is 'open up' - i e y has a minimum value which is 10
so the range is y <= 10