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Posted by on Monday, September 26, 2011 at 4:19pm.

Add polynomials
0.15x^4 + 0.10x^3
- 0.01x^3 + 0.01x^2 + x
1.25x^4 + 0.11x^2 + 0.01
027x^3 + 0.99
-0.35x^4 + 15x^2 - 0.03

I don't understand PLEASE PLEASE HELP!!

  • Algebra - , Tuesday, September 27, 2011 at 11:41am

    Just as you have to line up the decimal places with numbers, you can only add like powers with polynomials.

    So, add up all the terms with x^4: (0.15 + 1.25 - 0.35) = 1.05
    Add up all the x^3 terms: (0.10 -0.01 + 0.27) = 0.36 (assuming 027x^3 should be 0.27)
    Add up the x^2 terms: (0.01 + 0.11 + 0.15) = 0.27 (assuming 15x^2 should be .15)
    Add up all the x terms: (1) = 1
    Add up the plain numbers: (0.01 + 0.99 - 0.03) = 0.97

    Put it all together to get
    1.05x^4 + 0.36x^3 + 0.15x^2 + x + 0.97

    If my assumptions about decimal places are wrong, adjust things as needed.

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