Question 942537
(11+X)(8+X)=378
{{{88+19X+X^2=378}}}
{{{X^2+19X-290=0}}}*[invoke quadratic "x", 1, 19, -290 ]
The solutions to the equation are 10 and -29, the relevant solution here is the 10
In 10 years,the product of their ages will be 378