exam Maths Puzzle Numerical Ability

Simplify : [(3+i)x^2-ix+4+1i]-[(-2+3i)x^2+(1-2i)x-3]

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exam Other Question

can some one check this before i turn it in please?

(2r-3s)(4r^2+6rs+9s^2)

8r^3+27s^3
48r^4-162s^4
Hi! Could someone graph |3x-6y|<9