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# Simplify the expression and find its value when a = 5

Q. 10.     Simplify the expression and find its value when $a=5$ and $b=-3\; .2(a^{2}+ab)+3-ab$

$\\2( a^2 + ab ) + 3 - ab \\= 2a^2 + 2ab + 3 - ab \\= 2a^2 + ab + 3 \\= 2 \times 5^2 + 5 \times ( -3 ) + 3 \\= 50 - 15 + 3 \\= 38$