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If f(x)=x^(2) and g(x)=2x , then evaluat...

If `f(x)=x^(2) and g(x)=2x` , then evaluate,
(i) `(f+g)(3)" "(ii) (f-g)(2)`
(iii) `(f*g)(1)" "(iv) ((f)/(g))(5)`

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Verified by Experts

The correct Answer is:
(i) 15 (ii) 0 (iii) 2 (iv) `(5)/(2)`
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NAGEEN PRAKASHAN ENGLISH-RELATIONS AND FUNCTIONS-Exercise 2C
  1. If f(x)=2x-5 , then evaluate the following: (i) f(0) (ii) f(7) (...

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  2. If f(x)=x^(2), then evaluate: (f(1*2)-f(1))/(1*2-1)

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  3. If f(x)=x^(2) , then evaluate : (f(x+1)-f(x-1))/(4x)

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  4. If f(x)=(x)/(x-1), then evaluate : (f(a//b))/(f(b//a))

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  5. If f(x)=(x-1)/(x+1), then prove that: (f(b)-f(a))/(1+f(b)*f(a))=(b-a...

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  6. If f(x)=(1)/(1-x), then prove that : f[f{f(x)}]=x

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  7. If (x)=tan x, the prove that :f(x)+f(-x)=0

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  8. If f(x)=x+(1)/(x), then prove that : {f(x)}^(3)=f(x^(3))+3*f((1)/(x)...

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  9. If y=f(x)=(ax-b)/(bx-a), the prove that : x=f(y)

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  10. If f(x)=sin x + cos^(2)x, then prove that: f(x)=f(pi-x)

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  11. If f(x)=(1-x^(2))/(1+x^(2)), then prove that: f(tan theta)=cos 2thet...

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  12. If f(x)=x^2+x+1, then find the value of 'x' for which f(x-1) =f(x)

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  13. If f(x)=log(e)x, then prove that :f(xyz)=f(x)+f(y)+f(z)

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  14. If f(x)=log(e)x and g(x)=e^(x), then prove that : f(g(x)}=g{f(x)}

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  15. If f(x)=sqrt((1-x)/(1+x)), then evalaute :f(cos 2theta)

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  16. If f(x)="log"(1+x)/(1-x) , then prove that: f((2x)/(1+x^(2)))=2f(x)

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  17. If f:R to R is defined as: f(x)= {{:(2x+1, "if",x gt 2),(x^(2)-1,"if...

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  18. If f(x) = cos(log x) then f(x)f(y)-1/2[f(x/y)+f(xy)] has the value

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  19. If f(x)=3 cos x and g(x)=sin^(2)x, the evaluate: (f+g)((pi)/(2))

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  20. If f(x)=x^(2) and g(x)=2x , then evaluate, (i) (f+g)(3)" "(ii) (f...

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