Question

a+b=5 and a-b=1 then 8ab(a2+b2)=624

Answer 1

a+b =5
a-b=1 a=b+1
thus,a=3,b=2
8*3*2(9+4)=48*13=624 
hence proved
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Answer 2

a+b=5-----------1
a-b=1------------2

now add eq 1 n 2
a+b=5
a-b=1
_____
2a= 6
||a=3||

from 1 eq 3+b=5
b=2
now put the value of a n b in nxt one