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Mathieu is finding the x-intercepts of the function f (x) = x2 + 4x + 3. His work is shown below

. Which error did Mathieu make?

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  1. 21 June, 05:05
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    I can't see Mathieu's work but I will show the right steps and maybe you can find where Mathieu went wrong.

    f (x) = x^2+4x+3

    f (x) = (x+3) (x+1) Since 3*1=3 and 3+1=4

    The x-intercepts can be found by setting y to 0 and solving for x

    (in other words replace that f (x) thing with 0 and solve for x)

    0 = (x+3) (x+1)

    Now set both factors equal to 0

    x+3=0 or x+1=0

    x = -3 x=-1

    The x-intercepts are at (-3,0) and (-1,0)
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