exam Maths Puzzle Numerical Ability

(-2b6 + 3b4 - b2) + (b6 + 2b4 + 2b2). Please show me how to solve adding and subtracting polynomials

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I have to combine if possible no calculator or table of roots to be used...Can you help me please? Thanks...:)

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Number 20

6square5y - square root 20y
can you please help me answer: (((2x(2)+x-6 over 2x+4)))