Question 380292
multiply:

(x-9/2)(x+2/9)


FOIL
First Outer Inner Last


x^2 + 2/9 * x - 9/2 * x - 9/2 * 2/9 (9/2 and 2/9 are reciprocals)
x^2 + 2/9 * 2/2 * x - 9/2 * 9/9 * x - 1 (need common denominators)
x^2 + 4/18 * x - 81/18 * x - 1
x^2 - 77/18 * x - 1