Five mark example problems — task. Mathematics State Board, Class 9.

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Find the area of the square whose side length is \(3m + 2n - 4l\).

Answer:

The area of the square is

${9 m}^{2} + {4 n}^{2} + {16 l}^{2} + 12 mn - 16 \ln - 24 lm sq . units$
${9 m}^{2} + {4 n}^{2} - {16 l}^{2} + 12 mn - 16 \ln - 24 lm sq . units$
${9 m}^{2} + {4 n}^{2} + {16 l}^{2} - 12 mn - 16 \ln - 24 lm sq . units$
${9 m}^{2} + {4 n}^{2} + {16 l}^{2} + 12 mn + 16 \ln + 24 lm sq . units$

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