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i) f(-1)=2(-1)² - 3(-1)+8 = 2*1+3+8 = 13
ii) f( 1)=2( 1)² - 3( 1) +8 = 2*1 -3+8 = 7
Luego: f(-1)-f(1) = 13- 7
.:. f(-1)-f(1) = 6
Alternativa B) 6
Saludos! Jeizon1L