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5 February, 16:25

X2 + 12x< - 11 enter abswer in interval notation using groups ing symbols

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  1. 5 February, 18:57
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    X^2+12x<-11

    add 11 both sides

    x^2+12x+11<0

    wht 2 numbres multiply to get 11 and add to get 12

    11 and 1

    (x+1) (x+11) <0

    at x=-1 and x=-11

    test other numbers

    x=-10 gives us - 9<0, true

    x=-12 gives us 13<0, false

    x=0 give us 0<0, false

    so it is the range of numbers from - 1 to - 11

    -11
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