exam Maths Puzzle Numerical Ability

Factor the following expressions completely:

a. x^3-4x=0

b. 2x^2+7x-15=0

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exam Other Question

Scott is 22 years older than Sun Jung, In 7 years, Scott will be twice as old as Sun Jung. Give the current age of Scott and Sun Jung. Please help solve this problem, thanks
x^2 + 9 = 2x + 44