exam Maths Puzzle Numerical Ability

subtract: -4a^+4ab-3b^
3a^- ab-7b^

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exam Other Question

solve using the addition method
3x+2y=1
5x+3y=3

can you show me how to work this problem out?
For the pair of functions, perform the indicated operation.
f(x)=4x^2-7x,g(x)=x^2-3x-28
Find f/g