I'm not familiar with the "bisection method" to find the roots of 2x2-5x+1 = 0 but by completing the square or using the quadratic equation formula you'll find that the solution is:
x = (5 + or - the square root of 17) over 4
Hope that helps.
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Square roots are computed using the Babylonian method, calculators, Newton's method, or the Rough estimation method. * * * * * Or the Newton-Raphson method.
It has roots x = 2.618 and x = 0.38197
No real roots
The roots are: x = -5 and x = -9
There are no real root. The complex roots are: [-5 +/- sqrt(-3)] / 2