exam Maths Puzzle Numerical Ability

solve equation by completing the square

x^2 + x - 5 = 0

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exam Other Question

A = (a + b)5 over h

A = 300
b = 30
h = 2

300 = (a + 30)5 over 2

Need help on how to simplify to find what a = If f(x)=x(x+3)(x-1), use the interval notation to give all values of x where f(x)>0.