algebra

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Can you help see if I am arriving at the right answers?

1. F(x) =5x^2-2x
F (0), I got o
F (-1) I got 7
F (2) I got 16

2. -0.4x<-16
I got x>40

3. 8x-(5x+7) =14
My answer: 7/3

4. -19<=3x-8<=-7
My answer: -11/3<=x<=3

  • algebra -

    1. Correct

    2. Correct

    3. Check your signs on the distribution.

    4. -11/3 <= x <= ?
    Check your algebra.

  • algebra -

    I am still getting 3 what am I doing wrong
    3x-8<=-7
    3x+8-8<=-7+8
    3x<=1
    3/1=3

    x<=3

  • algebra -

    You are correct until the step 3x <= 1.

    3x * (1/3) <= 1 * (1/3)
    x <= 1/3

  • algebra -

    Oh my gosh I completely missed that, thank you.

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