Please answer these questions don't spam, urgent please answer i will make u brainliest
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Answer:
4. x²-4y²-6xy
5. -3a³+2b³-6ab²
Step-by-step explanation:
4.=( x²+y²-2xy)+(3x²+7y²-4xy)
=4x²+8y²-6xy
substract
=(4x²+8y²-6xy)-(3x²-4xg+7y²)
=x²-12y²-6xy
5.=(a³+b³-3a²b+7ab²)-(4a³-b³-3a²b+ab²)
=a³+b³-3a²b+7ab²-4a³+b³+3a²b-ab²
=-3a³+2b³-6ab²
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