Упростите (2a^2-3a+1)-(7a^2-5a)

Question

Упростите (2a^2-3a+1)-(7a^2-5a)

Answer 1

(2a² - 3a + 1) - (7a² - 5a) = 2a² - 3a + 1 - 7a² + 5a = - 5a² + 2a + 1