Was the expression a^2-b^2 = (a+b)(a-b) invented or discovered?

What is the range of the data below? .8090100

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

[tex]5 \times1 \frac{12}{13} [/tex] me