Question 1044520: 2cos(x-π/2)+3sin(x+π/2)-(3sinx+2cosx)=
Answer by Cromlix(4381)   (Show Source):
You can put this solution on YOUR website! Hi there,
if the graph of f(x)=-3x^2+2x+k passes through the point (-1,3) , then the value of k is ?
f(x)=-3x^2+2x+k
Substitute x = -1 and y = 3
3 = -3(-1)^2 +2(-1) + k
Multiply out
3 = -3 -2 + k
Collect like terms
3 + 3 + 2 = k
k = 8.
So, f(x) = -3x^3 + 2x + 8
Hope this helps. :-)
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