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Solve 7^(1+x)+7^(1-x)=50 for real x....

Solve `7^(1+x)+7^(1-x)=50` for real x.

A

`{1,1}`

B

`{1,-1}`

C

`{-1,1}`

D

none

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-QUADRATIC EXPRESSIONS-EXERCISE 1A (QUADRATIC EQUATIONS)
  1. If 2^x + 27 (2^(-x)) = 12 then x=

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  2. If 3^(2x)-3^(x+1)- 3^(x-1) + 1=0 then x=

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  3. Solve 7^(1+x)+7^(1-x)=50 for real x.

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  4. IF e^((cos ^2 x + cos ^4 + cos ^6 x+ . . . ) log 3) satissfies y^...

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  5. The equation x^((3//4))(log 2 x)^2 + log 2 x-5//4 = sqrt(2) ...

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  6. The number of real of the equation (2x -3)/(x-1) +1 =(6x^2 -x-6)/(...

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  7. The equation e^(sin x)-e^(-sin x)-4=0 has

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  8. The number of solutions of the system of equation given below...

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  9. The number of solution of the equation 9x^2-18|x|+5=0 belonging...

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  10. The number of solutions of the equation 5^x + 5^(-x)= log (10) 25...

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  11. IF the equation ax+by=1, cx ^2 +dy^2 =1 have only one solution ...

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  12. If a+b+c=0 then the quadratic equation 3ax^2+2bx+c=0 has at least one ...

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  13. If 2a+3b+6c =0 then the equation ax ^2 + bx +c=0 has atlest one ...

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  14. Let P(x) be a polynomial with integral coefficients . If there ...

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  15. IF 0< a<b<c<d , then the quadratic j equation ax ^2 +[1-a(b+c)x+ab...

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  16. alpha and beta are the roots of the equation x^2 +px +p^3 =0...

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  17. Find all number which exceed their square root by 12

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  18. The two consecutive positive odd integers such that the sum o...

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  19. Find two consecutive positive even integers, the sum of whose squares ...

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  20. The number having two digits such that it is 4 times the sum...

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