Question 447897

age of Li wei = x, Carlos age = x+7

three years ago, their ages are (x-3) and (x+4) respectively..

(x-3)(x+4) = 294

=> x^2 + x -12 = 294

=> x^2 + x - 306 = 0

=> x^2 +18x -17x -306 = 0

=> x(x+18) -17(x + 18) = 0

=> (x+18)(x-17)=0

so, x = 17 , x=-18 not possible.

ages are 17 and 24 .