anonymous
  • anonymous
In the chapter of Applications of Quadratic Equations... A girl's age in 12 years' time is the square of her present age. Find her present age. Help Plz!!!!
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Let the girls age be x. x + 12 = x^2 -x^2 + 12 + x = 0 Solve using quadratic formula now.
anonymous
  • anonymous
|dw:1328352273615:dw| i subtracted 12 because the question asked the present not her age in 12 years, but we could use it as given. . USE QUADRATIC FORMULA to find the value of x. . |dw:1328352430771:dw|
dumbcow
  • dumbcow
you could solve this by factoring x+12 = x^2 x^2 -x-12 = 0 (x-4)(x+3) = 0 x = 4

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anonymous
  • anonymous
thx!

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