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Use direct method to evaluate :
(ix) `(z- (2)/(3) ) (z+ (2)/(3) )`

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ICSE-IDENTITIES-EXERCISE 12(A)
  1. Use direct method to evaluate : (vii) (ab + x^2) (ab - x^2)

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  2. Use direct method to evaluate : (viii) (3x^2 + 5y^2) ( 3x^2 - 5y^2)

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  3. Use direct method to evaluate : (ix) (z- (2)/(3) ) (z+ (2)/(3) )

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  4. Use direct method to evaluate : (x) ((3)/(5) a + (1)/(2) ) ((3)/(5) ...

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  5. Use direct method to evaluate : (xi) (0.5 - 2a) ( 0.5 + 2a)

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  6. Use direct method to evaluate : (xii) ((a)/(2) - (b)/(3) ) ((a)/(2) ...

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  7. Evaluate : (i) (a+1) (a-1) (a^2 + 1)

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  8. Evaluate : (ii) (a+b) (a-b) (a^2 + b^2)

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  9. Evaluate : (iii) (2a - b) ( 2a + b) (4a^2 + b^2)

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  10. Evaluate : (iv) (3- 2x ) (3 + 2x ) (9+ 4x^2)

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  11. Evaluate : (v) (3x - 4y) (3x + 4y) (9x^ + 16y^2)

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  12. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (I) 21 x...

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  13. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (ii) 33 ...

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  14. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (iii) 10...

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  15. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (iv) 9.8...

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  16. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (v) 7.7 ...

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  17. Use the formula : (a+b) (a-b) = a^(2) - b^(2) to evaluate : (vi) 4.6...

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  18. Evaluate : (i) (6-xy) (6+ xy)

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  19. Evaluate : (ii) (7 x + (2)/(3) y) (7x - (2)/(3) y)

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  20. Evaluate : (iii) ((a)/(2b ) + (2b )/( a) ) ( ( a)/( 2b ) - (2b)/( a))

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