if a+2b=5
S.T a³+8b³+30ab=125
Answers
Answered by
3
Answer:
Step-by-step explanation: a+2b = 5 ----(1)
To prove: a³+8b³+30ab=125
On cubeing equation (1) , we get
(a+2b)³ = 5³
=> a³+(2b)³+3×a×2b×(a+2b)=125
we know the algebraic identity:
=> a³+8y³+6ab×5 = 125
From equation (1) , we get */
=> a³+8y³+30ab = 125
hope it's help you
PLS MARK IT AS BRAINLIEST
Similar questions