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anonymous

  • one year ago

If h(x) = 4x − 8 and j(x) = −x, solve h[j(3)] and select the correct answer below. −36 −20 1 4

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  1. jim_thompson5910
    • one year ago
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    if j(x) = -x, then what is j(3) equal to?

  2. anonymous
    • one year ago
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    umm idk.. is it j(-3) ?

  3. jim_thompson5910
    • one year ago
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    replace every x in the j(x) function with 3 you're on the right track, but it should be j(3) = -3 do you see how I got that?

  4. anonymous
    • one year ago
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    ooh okay yea i see

  5. jim_thompson5910
    • one year ago
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    so \(\Large h[{\color{red}{j(3)}}]\) turns into \(\Large h[{\color{red}{-3}}]\) this is possible because j(3) = -3. We can replace all of `j(3)` with `-3`

  6. jim_thompson5910
    • one year ago
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    now evaluate h(-3) by plugging x = -3 into the h(x) function

  7. anonymous
    • one year ago
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    h(-3)= 4(-3)-8 ??

  8. jim_thompson5910
    • one year ago
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    yep now simplify the right hand side

  9. anonymous
    • one year ago
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    yikes.. idk how to just to the right hand side

  10. jim_thompson5910
    • one year ago
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    4(-3)-8 is the same as 4*(-3)-8 in words it means "4 times -3, then subtract 8"

  11. anonymous
    • one year ago
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    -20

  12. jim_thompson5910
    • one year ago
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    you can use a calculator or work it out on paper here's a free calculator that's handy http://web2.0calc.com/

  13. jim_thompson5910
    • one year ago
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    yes, 4(-3)-8 = -20, so h(-3) = -20

  14. jim_thompson5910
    • one year ago
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    which means h[j(3)] = -20

  15. anonymous
    • one year ago
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    i always use mathway.com its awesome haha

  16. jim_thompson5910
    • one year ago
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    that works too

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