Evaluate : (i) (2x−35)(2x+35) (ii) (47a+34b)(47a−34b) (iii) (6−5

1.	Evaluate : (i) (2x−35)(2x+35) (ii) (47a+34b)(47a−34b) (iii) (6−5xy)(6+5xy) (iv) (2a+12a)(2a−12a) (v) (4x2−5y2)(4x2+5y2) (vi) (1.6x+0.7y)(1.6x−0.7y) (vii) (m+3)(m−3)(m2+9) (viii) (3x+4y)(3x−4y)(9x2+16y2) (ix) (a+bc)(a−bc)(a2+b2c2) (x) 203×197 (xi) 20.8×19.2
Answer» Evaluate : (i) $(2 x - \frac{3}{5}) (2 x + \frac{3}{5})$ (ii) $(\frac{4}{7} a + \frac{3}{4} b) (\frac{4}{7} a - \frac{3}{4} b)$ (iii) $(6 - 5 x y) (6 + 5 x y)$ (iv) $(2 a + \frac{1}{2 a}) (2 a - \frac{1}{2 a})$ (v) $(4 x^{2} - 5 y^{2}) (4 x^{2} + 5 y^{2})$ (vi) $(1.6 x + 0.7 y) (1.6 x - 0.7 y)$ (vii) $(m + 3) (m - 3) (m^{2} + 9)$ (viii) $(3 x + 4 y) (3 x - 4 y) (9 x^{2} + 16 y^{2})$ (ix) $(a + b c) (a - b c) (a^{2} + b^{2} c^{2})$ (x) $203 \times 197$ (xi) $20.8 \times 19.2$

Evaluate : (i) (2x−35)(2x+35) (ii) (47a+34b)(47a−34b) (iii) (6−5xy)(6+5xy) (iv) (2a+12a)(2a−12a) (v) (4x2−5y2)(4x2+5y2) (vi) (1.6x+0.7y)(1.6x−0.7y) (vii) (m+3)(m−3)(m2+9) (viii) (3x+4y)(3x−4y)(9x2+16y2) (ix) (a+bc)(a−bc)(a2+b2c2) (x) 203×197 (xi) 20.8×19.2

Answer»

Evaluate :

(i) $(2 x - \frac{3}{5}) (2 x + \frac{3}{5})$

(ii) $(\frac{4}{7} a + \frac{3}{4} b) (\frac{4}{7} a - \frac{3}{4} b)$

(iii) $(6 - 5 x y) (6 + 5 x y)$

(iv) $(2 a + \frac{1}{2 a}) (2 a - \frac{1}{2 a})$

(v) $(4 x^{2} - 5 y^{2}) (4 x^{2} + 5 y^{2})$

(vi) $(1.6 x + 0.7 y) (1.6 x - 0.7 y)$

(vii) $(m + 3) (m - 3) (m^{2} + 9)$

(viii) $(3 x + 4 y) (3 x - 4 y) (9 x^{2} + 16 y^{2})$

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

(x) $203 \times 197$

(xi) $20.8 \times 19.2$