exam Maths Puzzle Numerical Ability

-1(squared)=

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Hi! Could someone please help me with these problems and I need to simplify and all exponents should be positive.

(4x^3+2y) (2x^3-3y)

(3x4y^3-5y)-(2x+3y^-5y)

Thanks so much for your help! Football fields measure 100x53 1/3 yards excluding the two end zones, which each measure 10 x 53 1/3 yards. When comparing the football field with a basketball court that measures