Asked by Gilda
Application of Quadratic Equations.
A girl's age in 12 years' time is the square of her present age. Find her present age.
A girl's age in 12 years' time is the square of her present age. Find her present age.
Answers
Answered by
drwls
(x+12) = x^2
x^2 -x -12 = 0
(x-4)(x+3) = 0
x = 4 or -3
Sha can't have a negative age, so what does that leave you with?
x^2 -x -12 = 0
(x-4)(x+3) = 0
x = 4 or -3
Sha can't have a negative age, so what does that leave you with?
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