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anonymous

  • 4 years ago

write an equation for the inverse f(x)= x-7 ----- 2

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  1. anonymous
    • 4 years ago
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    what do you mean by mutliply both sides by 2?

  2. TuringTest
    • 4 years ago
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    1) rename f(x) and call it y 2) multiply both sides by 2 3) add 7 to both sides 4) switch the places of x and y 5) rename y f^(-1)(x) multiply both sides by 2 is like so: x=y/2 2x=y

  3. anonymous
    • 4 years ago
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    so the answer wouldnt be y=2x-14/4 after i multpily both sides by 2?

  4. TuringTest
    • 4 years ago
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    no, the 2's on the right cancel you also forgot to multiply the right side:\[y=\frac{x-7}2\]\[2y=x-7\]now continue with the rest of the steps

  5. TuringTest
    • 4 years ago
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    I meant you forgot to multiply the left side*

  6. anonymous
    • 4 years ago
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    okay so now i add 7 to -7 and x right? or to the 2y? im so confused on this stuff!

  7. TuringTest
    • 4 years ago
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    you add it to /both/ sides in an equation, if you do something to one side you must always do it to the other as well, or else the two sides won't be equal anymore

  8. anonymous
    • 4 years ago
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    alright, that makes sense.

  9. TuringTest
    • 4 years ago
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    good :D so go ahead and give it a try

  10. anonymous
    • 4 years ago
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    somehow, i got 9x=y

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