1.

\[{{\left( 3a-2b+5c \right)}^{2}}\]

A.  \[9{{a}^{2}}+4{{b}^{2}}+25{{c}^{2}}-12\,ab-20\,bc+30\,ac\]
B.  \[9{{a}^{2}}-4{{b}^{2}}-5{{c}^{2}}+12\,ab-20\,bc-30\,ac\]
C.  \[9{{a}^{2}}+4{{b}^{2}}-5{{c}^{2}}-12\,ab-20\,bc+30\,ac\]
D.  \[3{{a}^{2}}+4{{b}^{2}}-5{{c}^{2}}-12\,ab-20\,bc-30\,ac\]
Answer» B.  \[9{{a}^{2}}-4{{b}^{2}}-5{{c}^{2}}+12\,ab-20\,bc-30\,ac\]


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