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anonymous

  • one year ago

Please help me with this question!

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  1. anonymous
    • one year ago
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    |dw:1443649213389:dw|

  2. anonymous
    • one year ago
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    whats the area

  3. anonymous
    • one year ago
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    \[x ^{2}+3x-40 ft\]

  4. anonymous
    • one year ago
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    ft ^2

  5. Owlcoffee
    • one year ago
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    The area of any triangle is calculated by: \[A _{\triangle}=\frac{ b.h }{ 2 }\] This means, base time height divided by two. Since in the excercise we are given the area \(x^2+3x-40\) and we know that the base is \(x+8\), we can then use the formula above by replacing the data: \[x^2+3x-40=\frac{ (x+8)(h) }{ 2 }\] Now, it's just a matter to solve for "h".

  6. anonymous
    • one year ago
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    So, \[(x-5)(x+8)=\frac{ (x+8)(h) }{ 2 }\] Now, what do i do.

  7. Owlcoffee
    • one year ago
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    Well, now try to isolate that h on any side of the "=" sign.

  8. anonymous
    • one year ago
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    does the (x+8) cancel out?

  9. anonymous
    • one year ago
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    @owlcoffee

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