x3+x2-36x=36
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Given equation, x3+x2-36x=36
Given equation by trial and error, we can say x = -1 is one solution.
From this point, we can find the other two roots by using the Horner's rule for calculating the other two roots.
writing all the co-efficients of given equation, x3+x2-36x-36 = 0.
and in row2, at x =-1
1 | 1 | -36 | -36 |
0 | -1 | 0 | 36 |
1 | 0 | -36 | 0 |
From above table, the final equation in quadratic that we can obtain is,
x2-36 = 0
implies,
x = 6 or x = -6
The three roots are, x = -1, 6, -6
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