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anonymous

  • 5 years ago

Given f(x)=3x^2-10x, find all values for which f(x)=8

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  1. anonymous
    • 5 years ago
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    Subtract 8 and factor or use the quadratic formula

  2. anonymous
    • 5 years ago
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    \[3x^2-10x = 8\]

  3. anonymous
    • 5 years ago
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    \[3x^2-10x-8 =0\]

  4. anonymous
    • 5 years ago
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    i was questioning whether to set the problem to equal 8 and go from there or not. Thanks

  5. anonymous
    • 5 years ago
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    now u can factorise

  6. anonymous
    • 5 years ago
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    Yeah f(x)=y so treat it as a variable and just substitute the 8 in for it

  7. anonymous
    • 5 years ago
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    x=6, x=4

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