5-10 quadratic inequalities
if the solutions of the inequality x2-x-20 = 0 are xs-4 and x > 5, what are the x-values that are not solutions?
0
a
2-4 or xs5
b. xs 4 and x2-5
o
c. x< -4 or x> 5
lo
d. -4< x< 5
le

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.