Question

Evaluate the following when a = 2, b =1 and c=1

$\frac{ {a}^{2} + {b}^{2} - {c}^{2} }{2} \: \: \: please \: solve \: this \: question$
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Answer 1

Step-by-step explanation:

(2^2 + 1^2 - 1^2)/2

(4+1-1)/2

4/2

2=answer

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Answer 2

Answer:

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca.so.a²+b²+c²