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clara1223

  • one year ago

find f(-1) given that f(x)={(3x^2-1), (-1/4), (3x+2), (x is less than or equal to 4), (-4<x and x<2), (3x+2), (2 is less than or equal to x)} (it's supposed to be a matrix)

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  1. clara1223
    • one year ago
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    Please help! I am overwhelmed with the amount of questions on this review that I don't know. I could use as much help as you can give.

  2. dumbcow
    • one year ago
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    ok this is called a piecewise function, the function changes for different x values. match the given x value with correct domain, then use that function to input the x-value f(-1) ----> -1 is between -4 and 2, so you would use f(x) = -1/4

  3. dumbcow
    • one year ago
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    another example: f(3) ----> 3 is greater than 2, so use f(x) = 3x+2 plug in x=3 ----> 3(3)+2 = 11 f(3) = 11

  4. clara1223
    • one year ago
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    @dumbcow where did you get -1/4 from the fact that it is between -4 and 2?

  5. dumbcow
    • one year ago
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    because its given in the "matrix" x< -4 , 3x^2 -1 -4<x<2, -1/4 <----- x>2 , 3x+2

  6. clara1223
    • one year ago
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    @dumbcow thank you so much!

  7. dumbcow
    • one year ago
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    yw :)

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