Question

$find \: the \: value \: \\ 8x + 2y - 3xy + \frac{1}{2}x ^{2} for \: x = - 3 \: and \: y = 5$
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Answer 1

Answer:

Adding,

7xy(8x+2y−3) and 4xy2(3y−7x+8) 

= 56x2y+14xy2−21xy+12xy3−28x2y2+32xy2

= 12xy3−28x2y2+56x2y+46xy2−21xy