Answer:
(a) Resulting expression \[=\{(3x-y+11)+(-y-11)\}-(3x-y-11)\] \[=3x-y+11-y-11-3x+y+11\] \[=3x-3x+y-y-y+11+11-11\] \[\left| \text{rearranging terms} \right.\] \[=-y+11.\] (b) Resulting expression \[=\{(4+3x)+{{(5-4x+2x)}^{2}}\}\]\[-\{(3{{x}^{2}}-5x)+(-{{x}^{2}}+2x+5)\}\] \[=4+3x+5-4x+2{{x}^{2}}-3{{x}^{2}}+5x\]\[+{{x}^{2}}-2x-5\] \[=2{{x}^{2}}+{{x}^{2}}-3{{x}^{2}}+3x+5x-2x-4x\]\[+4+5-5\] \[=2x+4\].
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