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If |vecb|=4 and (veca+vecb)*(veca-vecb)=...

If `|vecb|=4` and `(veca+vecb)*(veca-vecb)=9`, then the value `|veca|` is -

A

5

B

`2sqrt(6)`

C

`3sqrt(2)`

D

none of these

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A
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 5
  1. If |veca|=7,|vecb|=sqrt(26) and |veca xx vecb|=35, then the value of v...

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  2. The equation of any plane parallel to y -axis is -

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  3. If |vecb|=4 and (veca+vecb)*(veca-vecb)=9, then the value |veca| is -

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  4. If the line vecr=(2hati-hatj+3hatk)+lambda(2hati+hatj+2hatk) is paral...

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  5. If the equation ax^(4)+bx^(3)+cx^(2)+kx=0 has a root alpha gt 0, the...

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  6. The chord of the curve ax^(2)+bx+c=0, joining the points x=p and x=q o...

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  7. The value of lim(x to 0) (10^(x)-2^(x)-5^(x)+1)/(x log(1+x)) is -

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  8. If f(x)=log(x)(log(e)x), then the value of f'(e ) is -

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  9. If y=(cos^(-1)x)^(2), then the value of (1-x^(2))y(2)-xy(1) is -

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  10. If y=sin(x^(2)), z=e^(y^(2)) and t=sqrt(z), then the value of (dt)/(dx...

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  11. If y=a^(x)b^(2x-1), then the value of (d^(2)y)/(dx^(2)) is -

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  12. If y=sqrt(sinx+sqrt(sinx+sqrt(sinx+...oo))), then the value of (dy)/(d...

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  13. If y=log(a)x+log(x)a+log(x)x+log(a)a, then the value of (dy)/(dx) is ...

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  14. If f(x)={(((4^(x)-1)^(3))/("sin"(x)/(a)log(1+(x^(2))/(3))),"when "x ne...

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  15. If (x+y)^(m+n)=x^(m)y^(n), then the value of (dy)/(dx) is -

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  16. If x+y=e^(x-y) then the value of (d^(2)y)/(dx^(2)) is -

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  17. If x=2 cos theta-cos 2 theta and y=2 sin theta-sin 2 theta, then the ...

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  18. Let f(x) be differentiable for all x. If f(1)=-2 and f'(x) ge 2 for ...

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  19. The value of the integral int(pi)^(10pi) |sinx|dx is equal to -

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  20. The value of the integral int(dx)/(x^(2)+4x+13) is -

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