exam Maths Puzzle Numerical Ability

how can i add to understand
5b^3-8b+2b^2 and 3b^2-7b^3+5b

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exam Other Question

Jeff is two years younger than Carrie. 12 years ago, Carrie was twice as old as Jeff. How old is Jeff now?

Thank you!:o) 3y2=5y-8=0 that should read 3y squared. I have to solve the equation(i.e. x=4 or 6)