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Mathematics
Mathematics
Problem
The slope of the tangent to the curve
y
=
−
x
3
+
3
x
2
+
9
x
−
27
y = -x^3 + 3x^2 + 9x - 27
y
=
−
x
3
+
3
x
2
+
9
x
−
27
is maximum when
x
x
x
equals : (A) 1 (B) 3 (C)
1
2
\frac{1}{2}
2
1
(D)
−
1
2
-\frac{1}{2}
−
2
1
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