Question

simplify : 2 (x^2+2xy)+5-xy+y^2 when x=(-3) and y=(5)​

Answer 1

Answer:

$x = - 3 \\ y = 5 \\ \\ 2( {x}^{2} + 2xy) + 5 - xy + {y}^{2} \\ = 2( { (- 3)}^{2} + 2( - 3)(5)) + 5 - ( - 3)(5) + {5}^{2} \\ = 2(9 + ( - 30)) + 5 - ( - 15) + 25 \\ = 2(9 - 30) + 5 + 15 + 25 \\ = 2( - 21) + 45 \\ = - 42 +45 \\ = \underline{ \underline{3}}$