book Maths Puzzle Numerical Ability

Please help me. Graph the function f(x)=2x - 1 for values of x where -1≤ x ≤4 (show all working)

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

Thank you....

Ray
what the need of x