If $a = 1$ , $b = - 1$ and $c = 0$ , find the value of expression $a^{2} - b c + a b - b^{2}$

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Solution

$a = 1, b = - 1, c = 0$
$a^{2} - b c + a b - b^{2}$
$= (1)^{2} - (- 1) \times 0 + 1 (- 1) - (- 1)^{2}$
$= 1 - 0 - 1 - 1$
$= - 1$

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