141.

Using a² – b² = (a + b)(a – b), find:

(12.1)² - (7.9)² 

Using (x + a) (x + b) = x² + (a + b)x + ab, find:

103 x 104

Using (x + a) (x + b) = x² + (a + b)x + ab, find:

5.1 x 5.2

Using (x + a) (x + b) = x² + (a + b)x + ab, find:

103 x 98

Using (x + a) (x + b) = x² + (a + b)x + ab, find:

9.7 x 9.8

Using suitable identity, find:

(i) (2x + 3y)²                            (ii) (103)²

Using suitable identity (x + a) (x + b) = x² + (a + b)x + ab find the following:

(i) (4p -3q)²                            (ii) (4.9)²

Using suitable identity^, find:

(i)




(ii) 983² - 17²


(iii) 194 x 206

Using suitable identity, (x +a) (x +b) = x² + (a + b)x + ab find the following


(i) 501 x 502                                        (ii) 95 x 103

Add: a + b + ab ; b – c + be and c + a + ac