(3х-2)*(3х+2)-(1+х)*(х-1) упростить

Question

(3х-2)*(3х+2)-(1+х)*(х-1) упростить

Answer 1

(3х - 2) * (3х + 2) - (1 + х) * (х - 1) = 9х² - 4 - х² + 1 = 8х² - 3