exam Maths Puzzle Numerical Ability

Subtract.
4x - 2x^2 + 4x^3 from
4x^3 + x - 3x^2

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exam Other Question

find two numbers of which the sum is 11 and the difference is 5. How many terms are in the expression 5m2 - mn + 4n + 7?
and

Which terms are alike?
xy2
2xy
x2
-xy
2x2y
xy

Simplify -3xy3 + 7xy3 + (-xy3) + (-3xy3).