Question

Evaluate (ab+bc+ca+a²+b²–c²+1)÷ 2a for a = 1,b=2 and c=3.​

Answer 1

Explanation:

$( ab + bc + ca + a {}^{2} + b {}^{2} + c {}^{2} + 1) \div 2a \\ ((1)(2) + ( 2 )(3) + (3)(1) + (1 \times 1) + (2 \times 2) + (3 \times 3) + 1) \div 2 \\ (2 + 6 + 3 + 1 + 4 + 9 + 1) \div 2 \\ 26 \div 2 \\ 13$

hope it helps u