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gjhfdfg

  • 3 years ago

Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f ° g)(-5).

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  1. dpaInc
    • 3 years ago
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    can you find g(-5) = ????

  2. dpaInc
    • 3 years ago
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    after you find g(-5), put that answer into f...

  3. gjhfdfg
    • 3 years ago
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    I'm a little lost, so pretty much just do this, -2*(-5) -7 and -4*(-5) + 3? Is that what your saying?

  4. dpaInc
    • 3 years ago
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    yes... but i only wanted g(-5)... so g(-5) = -4*(-5) + 3 = ???? what's the answer here?

  5. gjhfdfg
    • 3 years ago
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    23

  6. dpaInc
    • 3 years ago
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    good... now that you found g(-5)=23, that 23 goes into f. so you need to find f(23) = ???

  7. gjhfdfg
    • 3 years ago
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    It would be -53 wouldnt it?

  8. dpaInc
    • 3 years ago
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    that is the definition of (f ° g)(-5) = f(g(-5))

  9. dpaInc
    • 3 years ago
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    yes.... :) f(23) = -2*(23) - 7 = -46 -7 = -53

  10. dpaInc
    • 3 years ago
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    good work... :)

  11. gjhfdfg
    • 3 years ago
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    Thanks for your help.! =)

  12. dpaInc
    • 3 years ago
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    yw...:)

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