Question

(m-3)2-(3-m)(m+3) при m=1

Answer 1

(m-3)² - (3-m)(m+3)= (m-3)² + (m-3)(m+3) = 
= (m-3)(m-3+m+3) = (m-3)*2m
при m=1    (1-3)*2*1 = (-2)*2 = -4
Ответ: -4