Question

When asked his age,Michael said if you square my age ,then subtract 12 times my age , the result is 85 how old is he

Answer 1

let the age of Michael be x

$x {}^{2} - 12x = 85$

x^2-12x+5x-85=0

x(x-12)+5(x-12)
x+5=0 ,x-12=0
x=-5 , x=12

since age is positive,Michael age is 12 yrs