Evaluate 5

Evaluate expression x2−7x+12x−4 when x=−1

Correct result:

a =  -8

Solution:

x=−1 a=x2−7⋅ x+12⋅ x−4=(−1)2−7⋅ (−1)+12⋅ (−1)−4=−8

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Matematik
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