f(x)= x² -3x -10
f(-2)= (-2)² -3.(-2) -10
f(-2)= 4 +6 -10
f(-2)= 10-10
f(-2)= 0
f(-1)= (-1)² -3.(-1) -10
f(-1)= 1 +3 -10
f(-1)= 4 - 10
f(-1)= - 6
f(0)= 0² - 3.0 -10
f(0)= 0 - 0 -10
f(0)= - 10
f(3)= 3² - 3.3 -10
f(3)= 9 - 9 -10
f(3)= -10
f(5)= 5² - 3.5 -10
f(5)= 25 - 15 -10
f(5)= 10 - 10
f(5)= 0
f(1/2)= (1/2)² - 3.1/2 - 10
f(1/2)= 1/4 - 3/2 -10
f(1/2) = 1 - 6 - 40
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4
f(1/2)= -45/4
