Math, asked by sonaljaidev1909, 10 months ago

If a/b+b/a= 1then a3+b3=

Answers

Answered by seema713
0

Answer:

0

Step-by-step explanation:

 \frac{a}{b}  +  \frac{b}{a}  = 1 \\ by \: taking \: l \: c \: m we \: get \\   \frac{ {a}^{2}  +  {b}^{2} }{ab }  = 1 \\ by \: cross \: multiplication \: \\  {a}^{2}  +  {b}^{2}  = ab \\ now \:  {a}^{3}  +  {b}^{3}  = (a + b)( {a}^{2}  - ab +  {b}^{2} ) \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = (a + b)( {a}^{2}  +  {b}^{2}  - ab) \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = (a + b)( ab - ab)  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \: = (a + b) \times 0 \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 0

Similar questions