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What must be added to each of the following expressions to make it a whole squares? `4x^2-12 x+7` (ii) `4x^2-20 x+20`

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RD SHARMA ENGLISH-ALGEBRAIC EXPRESSIONS AND IDENTITIES-All Questions
  1. If x-y=7\ a n d\ x y=9, find the value of x^2+y^2

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  2. If 3x+5y=11\ a n d\ x y=2, find the value of 9x^2+25 y^2

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  3. Find the values of the following expressions: 16 x^2+24+9\ ,\ w h e ...

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  4. If x+1/x=9. find the value of x^4+1/(x^4)dot

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  5. If x+1/x=12 , find the value of x-1/xdot

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  6. If 2x+3y=14\ a n d\ 2x-3y=2, find the value of x y . [Hint use (2x+3y...

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  7. If x^2+y^2=29\ a n d\ x y=2, find the value of (i)x+y (ii) x-y

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  8. What must be added to each of the following expressions to make it ...

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  9. Simplify: (i)(x-y)(x+y)x^2+y^2)\ (x^4+y^4) (ii)(2x-1)\ (2x+1)(4x^2...

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  10. Simplify: (m^2-n^2m)^2+2m^3n^2

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  11. Show that : (3x+7)^2-84 x=(3x-7)^2 ...

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  12. Show that : (4p q+3q)^2-(4q p-3q)^2=48 p q^2 (a-b)(a+b)+(b-c)(b+c)...

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  13. Find the following products: (i) (x+2)(x+3) (ii)(x+7)(x-2) (iii...

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  14. Evaluate the following : 107\ X\ 103 (ii) 56\ X\ 48 (iii) 95\ X\ 97

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  15. Find the following products: (i)(x+4)(x+7) (ii) (x-11)(x+4) (iii)...

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  16. Find the following products: (i)(y^2-4)(y^2-3) (ii) (x+4/3)(x+3/4) ...

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  17. Find the following products: (i)(z^2+2)(z^2-3) (ii) (3x-4y)(2x-4y) ...

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  18. Find the following products: (z+3/4)(z+4/3) (ii) (x^2+4)(x^2+9) (y^...

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  19. Evaluate the following : 102\ xx\ 106 (ii) 109\ xx\ 107 (iii)35\ xx\...

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  20. Evaluate the following : 104\ xx\ 96 (ii) 34\ xx\ 36 (iii) 994\ xx\ ...

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