exam Maths Puzzle Numerical Ability

solve by using the quadratics formula
15nSQUARED-3=4n

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exam Other Question

Find the axis of symmetry. Your answer should be the equation that represents the axis of symmetry.
y = -x^2 + 10x - 1 # 7 sketch graph of the function. label coordinates of vertex. lesson 9.4.
y=-x^2+2x-3