exam Maths Puzzle Numerical Ability

How do yu solve this by using quadratic formula 2 = 0.7n + 0.6n2?
please show steps.

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exam Other Question

-3.38=r-9.76 From a square piece of cardboard with width x inches, a square of x - 3 inches is removed from the center. Write the area of the remaining piece as a function of x.