Question

Dada a função F(X) = 2x² - 4x + 5 , Calcule

a) F(3)
b) F(-2)
c) F(1) + F(2)

Answer 1

F(3)= 2.3.2-4x+5
= 2.9-4x+5
= 18-4x+5
= 14+5
= 19

F(-2)= 2.(-2).2-4x+5
= 2.4-4x+5
= 8-4+5
=4+5
= 9

Answer 2

F(X) = 2x² - 4x + 5 , Calcule

a) F(3) = 2(3)² - 4.(3) + 5 = 2.9 - 12 +5 ==> 18-12+5 ==> 1
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b) F(-2) = 2(-2)² - 4.(-2) + 5 = 2.4 + 8 +5 ==> 8+8+5 ==> 21
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c) F(1) + F(2) = 3 + 5 ==> 8

F(1) = 2(1)² - 4.(1) + 5 = 2.1 - 4 +5 ==> 2-4+5 ==> 3

F(2) = 2(2)² - 4.(2) + 5 = 2.4 - 8 +5 ==> 8-8+5 ==> 5
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