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exox

A laptop computer purchased for $1400. After each year the resale value decreased by 35%. What will be the resale value after 4 years?

  • 2 years ago
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  1. prady.iitkgp
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    1400(1-.35)^4

    • 2 years ago
  2. Flapdragon
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    Year 1 (35% of 1400= 490) 1400- 490= 910 Year 2 (35% of 910 = 318.5) 910- 318.5= 591.5 Year 3 (35% of 591.5= 207 * rounded to the nearest hundredth*) 591.5- 207= 384.5 Year 4 (35% of 384.5 = 134.6 *rounded to the nearest hundredth* ) 384.5 - 134.6= 249.9.

    • 2 years ago
  3. prady.iitkgp
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    @flapdragon why do such long calculation you will get same answer as mine unless you haven't made any mistake

    • 2 years ago
  4. Flapdragon
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    Just in case the person who asked the question needs to know how I got the answer. :)

    • 2 years ago
  5. jenb
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    in this case a=1,b=k,c=k+1 so for \[\Delta = k ^{2}-4\left( k +1 \right) =k ^{2}-4k -4\] now use quadratic formula on this to find k.\[\div 2k=\left( 4\pm \sqrt{16-4\times -4} \right)\div2=\left( 4\pm \sqrt{32} \right)\div2=\left( 4\pm4\sqrt{2} \right)\]\[\div2=2\pm2\]

    • 2 years ago
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