exam Maths Puzzle Numerical Ability

Solve the equation: x² + 3x - 54 = 0


I cant do this at all :[

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exam Other Question

sqrt 5x2 + 3 sqrt 20x2 +7 sqrt 20x2 Which of the following is an exponential function?
a. f(x) = x2
b. L(t) = 1 - e-t
c. g(q) = q-2
d. R(x) = 4 ln(x)