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If the two equation x^(2)-cx+d=0 and x^(...

If the two equation `x^(2)-cx+d=0` and `x^(2)-ax+b=0` have one common root and the second has equal roots then 2(b + d) is equal to

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A DAS GUPTA-Equations, Inequation and Expressions-Exercise
  1. Prove that equations (q-r)x^2 + (r-p)x + p-q = 0 and (r-p)x^2+(p-q)x+q...

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  2. Prove that , if the equations x^2+bx+ca=0 and x^2+cx+ab=0 have only no...

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  3. If the two equation x^(2)-cx+d=0 and x^(2)-ax+b=0 have one common root...

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  4. If ax^2+2bx+c=0 and a1x^2=2b1x+c1=0 have commonroot and a/a1,b/b1,c/c1...

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  5. If equations ax^(2)-bx+c=0 (where a,b,c epsilonR and a!=0) and x^(2)+2...

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  6. If a,b,c, a1,b1,c1 are rational and equations ax^2+2bx+c=0 and a1x^2+2...

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  7. If the equation x^2+ax+12=0 , x^2 +bx +15 =0 and x^2 (a+ b) x+ 36 =0 ...

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  8. Let lambda,mu be such that the equations 4x^2 - 8x + 3 = 0, x^2 + lamb...

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  9. Find the values of a for which x^2-ax+1-2a^2ge0 for real values of x.

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  10. Find the minimum value of 3x^2-6x+7, x in R and also find the correspo...

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  11. Find the maximum value of (2+3x)(1-x),x in R and also find the corresp...

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  12. If f(x) = (x^2 -2x + 4)/(x^2+2x+4), x in R then range of function is

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  13. Range of (x^2-x+1)/(x^2+x+1) is

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  14. If for all real x (x+a)/(x^2+b x+c^2) cannot lie between two limits, ...

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  15. If x is real, show that the expression (4x^2+36 x+9)/(12 x^2+8x+1) can...

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  16. If x in R ,a n da ,b ,c are in ascending or descending order of magni...

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  17. If f(x)=(ax^2+x-2)/(a+x-2x^2) has the range R when x in R then

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  18. Let f(x)=(mx^2+3x+4)/(x^(2)+3x+4) , m in R . If f(x) lt 5 for all x i...

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  19. For x in R, the expression (x^2+2x+c)/(x^2+4x+3c) can take all real va...

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  20. x^2-x y+y^2-4x-4y+16=0 represents a. a point b. a circle c. a pair...

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