Answer:
\[2({{a}^{2}}+ab)+3-ab\] \[=2{{a}^{2}}+2ab+3-ab\] \[=2{{a}^{2}}+2ab-ab+3\] \[\left| \text{rearranging terms} \right.\] \[=2{{a}^{2}}+ab+3\] \[=2{{(5)}^{2}}+(5)(-3)+3=50-15+3\] \[=50+3-15=53-15=38\]
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