The difference between two numbers is 9 and the product of the number is 162. find the numbers

If you make the two numbers X and Y then we can make a system of equations:

Y - X = 9
X*Y = 162

Using the first equation you can set Y equal to (9 + X) and then plug that in to the second equation

X*(9 + X) = 162

Then if we multiply that out and subtract 162 from both sides we get a quadratic equation

X^2 + 9X - 162 = 0

From here you can just factor to get:

(X + 18)(X - 9) = 0
X = -18, 9

Then when you solve for Y you’re two numbers are either (-18, -9) or (9, 18).

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