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If a+b=7\ \ a n d\ \ a b=12 , find the v...

If `a+b=7\ \ a n d\ \ a b=12 ,` find the value of `a^2+b^2`

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Verified by Experts

we know,
`(a+b)^2=a^2+b^2+2ab`
`(7)^2=a^2+b^2+2(12)`
`49=a^2+b^2+24`
`a^2+b^2=49-24=25`
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RD SHARMA-ALGEBRAIC IDENTITIES-All Questions
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  2. If x+1/x=3, then the value of x^6+1/x^6is.

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  3. If a+b=7\ \ a n d\ \ a b=12 , find the value of a^2+b^2

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  4. If a-b=5 and a b=12 , find the value of a^2+b^2

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  5. If x-1/x=1/2 , then write the value of 4x^2+4/(x^2)

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  6. If a^2+1/(a^2)=102 , find the value of a-1/a

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  7. If a+b+c=0 , then write the value of (a^2)/(b c)+(b^2)/(c a)+(c^2)/(a ...

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  8. If x+1/x=5, then x^2+1/(x^2)=?

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  9. If x+1/x=2, then x^3+1/(x^3)=? (a)64 (b) 14 (c) 8 (d) 2

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  10. If x+1/x=4, then x^4+1/(x^4)=? (a)196 (b) 194 (c) 192 (d) 190

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  11. If x+1/x=3, then x^6+1/(x^6)=? (a)927 (b) 414 (c) 364 (d) 322

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  12. If x^4+1/(x^4)=623 , then x+1/x=? (a)27 (b) 25 (c) 3sqrt(3) (d) ...

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  13. If x^2+1/(x^2)=102 , then x-1/x=? (a)8 (b) 10 (c) 12 (d) 13

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  14. If x^3+1/(x^3)=110 , then x+1/x=? (a)5 (b) 10 (c) 15 (d) none of ...

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  15. If x^3-1/(x^3)=14 , then x-1/x=? (a)5 (b) 4 (d) 3 (d) 2

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  16. If x^4+1/(x^4)=194 , find x^3+1/(x^3),x^2+1/(x^2) and x+1/x

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  17. If x-1/x=(15)/4, then x+1/x\ =? (a)4 (b) (17)/4 (c) (13)/4\ (d...

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  18. If 3x+2/x=7, then (9x^2-4/(x^2))=? (a)25 (b) 35 (c) 49 (d) 30

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  19. If a^2+b^2+c^2-a b-b c-c a=0, then a+b=c b+c=a c+a=b a=b=c

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  20. If a+b+c=0 , then (a^2)/(b c)+(b^2)/(c a)+(c^2)/(a b)=?\ (a)0 (b) ...

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