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maobadi
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Homework Statement
1. Calculate the gradient of the curve y = 2x3 - 5x2 + 46x + 87 at the point where it crosses the x-axix.
2. Show by differentiation and solving a quadratic equation, that there are no points on the above curve where the gradient is zero.
Homework Equations
y = 2x3 - 5x2 + 46x + 87
The Attempt at a Solution
dy/dx = 6x2 - 10x + 46
It crossess at x-axis where y = 0 ( it it right...?) I then calculate the roots of the equation, and the two roots of x are the points where it crossess the x-axis.
How do I do the part 2 problem...?
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