Question

Please answer this question very fast.​

Answer 1

Answer: 624

Step-by-step explanation:

$x+y=5\\x-y=1$

On solving these,

$x=3\\y=2$

$8xy(x^{2} +y^{2})=8(3)(2)(3^{2}+2^{2} )\\=48(13)\\=624$