Question

please solve question 19 and 20​

Answer 1

Answer:

Hey mate here is your answer...

Question no.19 refers to this attachment..

Answer 2

Answer:

hope it helps

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Step-by-step explanation:

19- GIVEN, x² + 1/x² = 14.

______________________________

We know, a²+b² = (a+b)² - 2 ab

So, (x+1/x) ² - 2 = 14

=> (x+1/x) = √16 = 4

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We also know, a²+b² = (a-b)² + 2 ab

So, (x-1/x)² + 2 = 14

=> (x - 1/x) = √12

______________________________

Ultimately, x² - 1/x²

= (x + 1/x) (x - 1/x)

= 4√12 [ANSWER]

20- 2x + cy = 8

for equal value of x ,y

2x + cx = 8

c= 8 -2x/ x