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22 November, 18:10

Lucia finds that (3x^2+3x+5) + (7x^2-9x+8) = 10x^2-12x+13. What error did Lucia make?

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  1. 22 November, 20:34
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    The answer

    to do the calculus, the method is

    taking off the paranthesis

    adding the term with a similar degree

    summing constant terms

    (3x^2+3x+5) + (7x^2-9x+8) =

    = 3x^2+3x+5 + 7x^2-9x+8

    = 3x^2 + 7x^2 + 3x+5 - 9x+8

    = 10x² + 3x - 9x + 5 + 8

    = 10x² - 6x + 13

    the answer is

    (3x^2+3x+5) + (7x^2-9x+8) = 10x² - 6x + 13

    the error that Lucia did make 3x - 9x = - 12x, instead of 3x - 9x = - 6x
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