Your answer would be: -3x2 + 3x - 6.
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0.4x + 3.9 = 5.78
1. Subtraction property of equality:
Subtract 3.9 from both sides of the equal sign:
0.4x = 1.88
2. division property of equality:
Divide both sides of the equal sign by 0.4:
X = 4.7
The derivative of 
at a point 
in the direction of a vector 
is
We have
and
Then the derivative at 
in the direction of 
is
B:(3,-4)
2x-(-x-1)=10
X=3
Y=-3-1
Y=-4
