Question

X+y=5,x-y=1 then 8xy (x^+y^)=?

Answer 1

Answer:

$x + y = 5 \\ x - y = 1 \\ by \: simultaneous \: eqn \\ 2x - y + y = 6 \\ 2x = 6 \\ x = 3 \\ put \: the \: value \: n \: equation \: 1 \\ 3 + y = 5 \\ y = 5 - 3 \\ y = 2 \\ 8 \times 3 \times 2( {3}^{2} + {2}^{2} ) = 624$

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