if h(x)=-7(x-3)^2 find h (10)
When your problem says h(10) it means plug in 10 wherever there's an x...
I'll demonstrate.
h(10) = -7 (10 - 3)^2
Let's clean up that (10-3):
h(10) = -7 (7)^2
And impliment that square:
h(10) = -7 (49)
And your answer is....
h(10) = -343