Question

The value of a2 + b2 – ab + bc – ac + a for a = 1, b = 2 and c = -1 is = _____

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Answer 1

Answer:

3

Step-by-step explanation:

a² + b² - ab + bc - ac + a

(1)² + (2)² - (1)(2) + (2)(-1) - (1)(-1) + 1

1 + 4 - 2 - 2 +1 +1

7-4

3

Answer 2

Answer:

3

Step-by-step explanation:

1+4-2-2+1+1

7-4=3 ans