exam Maths Puzzle Numerical Ability

Solve by completing the square.
2x^2-12x-18=0
How do you do it. Thanks

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exam Other Question

please help me sketch the graph of y=2x and 3y=7x+3 over the interval -3 Find values for m and b in the following system so that the solution to the system
is (-3,4).

5x+7y=b

mx+y=22