exam Maths Puzzle Numerical Ability

Divide.
x^4 + x^2 - 80/ x + 3
The answer I got is this:
x^3 - 3x^2 + 10x + 30 + 10/x+3

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exam Other Question

I am in dyer need at this point, can someone help me?

3x+4y<12
x+3y<6
x>0
y>0 a recatngular ro0m is 7ft longer than its wide.its area is 228ft squared.what is the width of the ro0m??