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Numbers 20 - 22 please

Numbers 20 - 22 please
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3 votes
Numbers 20 - 22 please

Numbers 20 - 22 please-example-1
User Strake
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(x+5)(x+2)=x^2+2x+5x+10=x^2+7x+10\\\\ (x-1)(2x^2-4x+10)=2x^3-4x^2+10x-2x^2+4x-10=\\ =2x^3-6x^2+14x-10\\\\ (c^2-10)(4c+3)=4x^3+3c^2-40c-30
User Rposky
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