if a+2b =5 ; then show that : a^3+8b^3+30ab=125
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hii friend
good evening !!
a+2b = 5
a= 5-2b
then take left side part from equation :
a cube + 8b cube + 30 ab
= (5-2b) cube + 8b cube + 30 (5-2b)b
= 125 - 8b cube + 3(5)(-2b)(5-2b) + 8b cube + 30 (5-2b)b
= 125 -30 b ( 5-2b) + 30(5-2b)b + 8b cube - 8b cube
= 125
then left side part = right side part
proove that ....
good evening !!
a+2b = 5
a= 5-2b
then take left side part from equation :
a cube + 8b cube + 30 ab
= (5-2b) cube + 8b cube + 30 (5-2b)b
= 125 - 8b cube + 3(5)(-2b)(5-2b) + 8b cube + 30 (5-2b)b
= 125 -30 b ( 5-2b) + 30(5-2b)b + 8b cube - 8b cube
= 125
then left side part = right side part
proove that ....
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