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anonymous

  • one year ago

If f(x) = 5x2 − 4 and g(x) = x − 2, what is (f o g)(-3)? (A) -129 (B)1 (C)39 (D)121

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  1. xapproachesinfinity
    • one year ago
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    \[f(g(x))=5(g(x))^2-4=2(x-2)^2-4=2[x^2-4x+4]-4=2x^2-8x+4\] so fog(-3)=2(-3)^2-8(-3)+4

  2. anonymous
    • one year ago
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    soo it would be 121

  3. xapproachesinfinity
    • one year ago
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    another way and perhaps easy is to plug -4 into g first g(-3)=-3-2=-5 then plug -5 into f f(-5)=?

  4. xapproachesinfinity
    • one year ago
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    that's not what i got

  5. anonymous
    • one year ago
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    what did u get

  6. xapproachesinfinity
    • one year ago
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    46

  7. anonymous
    • one year ago
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    i got it right it was 121

  8. xapproachesinfinity
    • one year ago
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    oh i did some mistake in calculations

  9. xapproachesinfinity
    • one year ago
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    i got 121 too just error lol

  10. xapproachesinfinity
    • one year ago
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    i used first one it should read 5x^2-20x+16

  11. xapproachesinfinity
    • one year ago
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    i by mistake multiplied by 2 there

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