Question 174345
h^2-9hs+9s^2
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h = [9s +- sqrt(81s^2 - 4(9s^2)]/2

h = [9s +- sqrt(45s^2)]/2

h = [9s +- 3ssqrt(5)]/2

Factors:
[h-(9s + 3s*sqrt(5))/2]*[[h-(9s - 3s*sqrt(5))/2]
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Cheers,
Stan H.