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In how many points graph of `y=x^3-3x2+5x-3`interest the x-axis? |
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Answer» The number of points in which ` y = x^(3) - 3x^(2) + 5x - 3` intersects the x-axis is same as the number of real roots of the equation ` x ^(3) - 3x^(2) + 5x - 3 = 0`. Now we can see that x = 1 satisfies the equation, hence one root of the equation is x = 1. Now dividing ` x^(3) - 3x^(2) + 5x-3` by x - 1 , we have the quotient ` x^(2) - 2x + 3`. Hence the equation reduces to `(x-1)(x^(2)-2x+3)= 0`. Hence the only root of the equation is x = 1. Thus, the graph of ` y = x^(3) - 3x^(2) + 5x - 3` cuts the x - axis in one point only. |
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