What is the discriminant of the polynomial below?
2x^2 + 4x - 9

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

In a column proof the right column states your reasons

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.