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(-7x²-7x-7)-[(7x³-9x²-20)+(4x-11)]]=? (5x⁴+8x²+2)+7(5x⁴-3x²)=? Please explain the work behind the solution

(-7x²-7x-7)-[(7x³-9x²-20)+(4x-11)]]=? (5x⁴+8x²+2)+7(5x⁴-3x²)=? Please explain the work behind the solution
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(-7x²-7x-7)-[(7x³-9x²-20)+(4x-11)]]=?

(5x⁴+8x²+2)+7(5x⁴-3x²)=?
Please explain the work behind the solution

User Sirvon
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1 Answer

7 votes

(-7x^2-7x-7)-[(7x^3-9x^2-20)+(4x-11)]]=\\=-7x^2-7x-7-(7x^3-9x^2-20+4x-11)=\\=-7x^2-7x-7-7x^3+9x^2+20-4x+11=-7x^3+2x^2-11x+24\\\\ (5x^4+8x^2+2)+7(5x^4-3x^2)=5x^4+8x^2+2+35x^4-21x^2=\\=39x^4-13x^2+2
User Vor
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