exam Maths Puzzle Numerical Ability

In[(sqrt)2x(x+3)^5]

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exam Other Question

how do I solve (x-2)(x+1)≥0
related equation: (x-2) (x+1)=0
solutions for the equation: (2,-1)
intervals
(-∞,-1)(-1,2)(2,∞) After this I am confused ?
f(x)=(x-4)(x+2) #69 Find the interest on a $5000 bond that pays an annual percent rate of 61/2% for 6 years.