What two numbers add and get -18 and multiply and get 72?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.