book Maths Puzzle Numerical Ability

I really need your help on this factoring....seems like there is no answer:
36x^2 - 18x + 9 = 0.

Thank you....

Ray

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book Other Question

If someone could please help me with the following problem that would be great.
f(x)=2x^2-3x+7 g(x)=3x+5
19.f(g(x)) Please help me. Graph the function f(x)=2x - 1 for values of x where -1≤ x ≤4 (show all working)