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inn [45]
2 years ago
9

A girl's age in 12 years' time is the square of her present age. Find her present age.

Mathematics
2 answers:
SIZIF [17.4K]2 years ago
4 0

Answer:

  4

Step-by-step explanation:

Let x represent her present age. The given relation is ...

  x +12 = x^2

Putting this in standard form, we can factor it:

  x^2 -x -12 = 0

  (x -4)(x +3) = 0

Solutions to this quadratic are x = 4, x = -3. The -3 solution is extraneous in this context.

The girl's present age is 4.

harkovskaia [24]2 years ago
3 0

Answer: her present age is 4

Step-by-step explanation:

Proof: 4+12=16

Square root 4 is 16

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