Math, asked by sumaira55, 7 months ago

if a+2b=5
S.T a³+8b³+30ab=125 ​

Answers

Answered by rajutusharengineerin
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

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