exam Maths Puzzle Numerical Ability

Solve the equation: x� + 3x - 54 = 0

I cant do this at all :[

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exam Other Question

how do you draw an acute scalene triangle NDK and construct a segment from c perpendicular to ND I have no idea how to type in math problems - (i.e., Squared, etc.)
My problem is finding the LCD and steps to solve reational expressions.
7x + 1 divided by x squared minus 9 (minus) 5 divided by x minus 3
Thank you!