c) \(11\cdot2^4+6^2\cdot19+40\)
\(=11\cdot2^4+2^2\cdot3^2\cdot19+2^3\cdot5\)
\(=2^2\left(11\cdot2^2+3^2\cdot19+2\cdot5\right)\)
\(=2^2\cdot\left(11\cdot4+9\cdot19+2\cdot5\right)\)
\(=2^2\cdot\left(44+171+10\right)\)
\(=2^2\cdot225\)
\(=900\)
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