Question

A mans age after, 15 years became square of his age before 15 years..

a, If x is the present age, form a second degree equation..

b, calculate the present age..​

Answer 1

Step-by-step explanation:

$let \: present\: age \: be \: x$

$(x - 15 )^{2} = {x}^{2} \\ {x}^{2} + 225 - 30x = {x}^{2} \\ {x}^{2} - {x}^{2} - 30x = - 225 \\ - 30x = 225 \\ x = \frac{ - 225}{ - 30} = \frac{15}{2}$