Evaluate : (i) (6−xy)(6+xy) (ii) (7x+23y)(7x−23y) (iii) (a2b+2ba)(

1.	Evaluate : (i) (6−xy)(6+xy) (ii) (7x+23y)(7x−23y) (iii) (a2b+2ba)(a2b−2ba) (iv) (3x−12y)(3x+12y) (v) (2a+3)(2a−3)(4a2+9) (vi) (a+bc)(a−bc)(a2+b2c2) (vii) (5x+8y)(3x+5y) (viii) (7x+15y)(5x−4y) (ix) (2a−3b)(3a+4b) (x) (9a−7b)(3a−b)
Answer» Evaluate : (i) $(6 - x y) (6 + x y)$ (ii) $(7 x + \frac{2}{3} y) (7 x - \frac{2}{3} y)$ (iii) $(\frac{a}{2 b} + \frac{2 b}{a}) (\frac{a}{2 b} - \frac{2 b}{a})$ (iv) $(3 x - \frac{1}{2 y}) (3 x + \frac{1}{2 y})$ (v) $(2 a + 3) (2 a - 3) (4 a^{2} + 9)$ (vi) $(a + b c) (a - b c) (a^{2} + b^{2} c^{2})$ (vii) $(5 x + 8 y) (3 x + 5 y)$ (viii) $(7 x + 15 y) (5 x - 4 y)$ (ix) $(2 a - 3 b) (3 a + 4 b)$ (x) $(9 a - 7 b) (3 a - b)$

Evaluate : (i) (6−xy)(6+xy) (ii) (7x+23y)(7x−23y) (iii) (a2b+2ba)(a2b−2ba) (iv) (3x−12y)(3x+12y) (v) (2a+3)(2a−3)(4a2+9) (vi) (a+bc)(a−bc)(a2+b2c2) (vii) (5x+8y)(3x+5y) (viii) (7x+15y)(5x−4y) (ix) (2a−3b)(3a+4b) (x) (9a−7b)(3a−b)

Answer»

Evaluate :

(i) $(6 - x y) (6 + x y)$

(ii) $(7 x + \frac{2}{3} y) (7 x - \frac{2}{3} y)$

(iii) $(\frac{a}{2 b} + \frac{2 b}{a}) (\frac{a}{2 b} - \frac{2 b}{a})$

(iv) $(3 x - \frac{1}{2 y}) (3 x + \frac{1}{2 y})$

(v) $(2 a + 3) (2 a - 3) (4 a^{2} + 9)$

(vi) $(a + b c) (a - b c) (a^{2} + b^{2} c^{2})$

(vii) $(5 x + 8 y) (3 x + 5 y)$

(viii) $(7 x + 15 y) (5 x - 4 y)$

(ix) $(2 a - 3 b) (3 a + 4 b)$

(x) $(9 a - 7 b) (3 a - b)$