Jika teman-teman sedang berusaha melihat cara mengerjakan dari soal A boy's age in 20 years' time will be the square of his present age. Find his present age., maka teman-teman sudah berada di tempat yang benar.
Kami ada 1 cara menyelesaikan dari A boy's age in 20 years' time will be the square of his present age. Find his present age.. Silakan baca jawaban selanjutnya disini:
Jawaban:
5 y.o
Penjelasan dengan langkah-langkah:
His present age= x
[tex]x + 20 = x^2 \\ x^2 - x - 20 = 0 \\ (x + 4)(x - 5) = 0[/tex]
[tex]x + 4 = 0 \\ x = - 4[/tex]
or
[tex]x - 5 = 0 \\ x = 5[/tex]
age must be in positive number, therefore x=5
So, his present age is 5 y.o
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