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Using contrapositive method show that the following statement is true. If x is a real number such that `x^3=-4x then x = 0.

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 7-EXERCISE
  1. If n(p(r-1))/a=n(pr)/b=n(p(r+1))/c,then show that b^2=a(b+c)

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  2. Show that the four lines 2x+y+1=0,2x+y+7=0,x+2y-1=0 and x+2y+5=0 form ...

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  3. Find the equation-of the bisector of the obtused angle between the st...

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  4. The co-ordinate of centre and the diameter of a circle are (3, 7) and ...

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  5. Find the ratio in which the YZ. plane divides the line segment joining...

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  6. Evaluate :lim(xrarr0)(sqrtcosx-root(3)(cosx))/(sin^2x)

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  7. Find, form 1st principles, the derivatives of tansqrtxwith respect to ...

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  8. Using contrapositive method show that the following statement is true....

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  9. Find the validity of the following biconditional Statement. A triangle...

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  10. For any three events A. B.' C show thatP(AcupBcupC)=P(A)+P(B)+P(C)-P(A...

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  11. The mean and SD of the scoreing marks of 100 students are 40 and 5.1 r...

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  12. if tan (beta/2)=4 tan (alpha/2),show that tan( (beta-alpha)/2)=(3sinal...

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  13. If xcos(theta+120^@)=y cos (theta+240^@),show that x-y=-(x+y)sqrt3tant...

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  14. If one root is the square of another of an equationax^2+2ibx+ic=0,then...

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  15. If the sum of 1st M terms of an AP is m. and the sum of 1st N terms is...

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  16. Exhibit graphically the solution region of the following system of 'in...

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  17. How many numbers can be formed with the digits 1, 2, 3, 4, 3, 2, 1 so ...

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  18. Find the equation of an ellipse having eccentricity 2/3 and the co-ord...

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  19. The axis of a parabola is along x axis and vertex is(0.0).If it passes...

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  20. e1and e2 are respectively the eccentricities of a hyperbola and its ...

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