Question

Let
$a = {15x}^{2} + {12y}^{2} + 14xy + 19 \\ b = {34x}^{2 } - 12xy \: + {19y}^{2} + 17 \\ c = {21x}^{2} \: - {5y}^{2} \: + {17xy} \: \: + 7$
Find 1. A+B+C​
plzz help
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Answer 1

Hello!
Answer...

=》A + B + C
$({15x}^{2} + {12y}^{2} + 14xy + 19) + ({34x}^{2 } - 12xy \: + {19y}^{2} + 17) + ({21x}^{2} \: - {5y}^{2} \: + {17xy} \: \: + 7)$

${15x}^{2} + {12y}^{2} + 14xy + 19 + {34x}^{2 } - 12xy \: + {19y}^{2} + 17 + {21x}^{2} \: - {5y}^{2} \: + {17xy} \: \: + 7$

${60x}^{2} + {26y}^{2} + {19xy} \: + 43$

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Answer 2

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