Question

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Answer 1

Answer:

(1) 3a^2+3b^2

(2)9x+4y

(3)5x^3+x^2y-2xy^2-7y^3

(4)8x^3-6x^2+2x-1

Hope it's helpful if want step by step comment now

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Answer 2

i) a² + 2ab + b² + a² - 2ab + b² + a² + b²

= 3a² + 3b²(+2ab and -2ab will cancel themselves or becomes zero in simple language.)

ii) 5x - 6y + 8x +7y + (-4x + 3y)

= 13x + y - 4x + 3y ( - and + becomes -)

= 9x + 4y

iii) x³ - 3x²y + 4xy² - y³ + 4x³ - 6xy² + 4x²y - 6y³

= 3x³ + x²y - 2xy² - 7y³ ( now, convert into standard form of polynomials)

= 3x³ - 7y³ + x²y - 2xy²

iv) 6x³ + 8 + 7x - 8x² + 3x² - 9 - 8x + 3x - x² + 2x³

= 8x³ - 1 - x - 6x² ( now, convert into standard form of polynomials)

= 8x³ - 6x² - x - 1

Hope this helps please mark as brainliest.