Question

Using the formula (a – b)2 = (a2 – 2ab + b2) evaluate:
(i)(196)2
(ii)(689)2
(iii)(891)2
Note:2 means square like (2)2=4 and if don't know the answer don't write anything otherwise I am going to report the answer

Answer 1

Answer:

(i) 38416

(ii) 474721

(iii) 793881

Step-by-step explanation:

(i) (196)² = (200- 4)² = 200² - 2× 200 ×4 + 4²

=40000- 1600 + 16 = 38416

(ii)(689)² = (700- 11)² = 700²‐ 2×700×11 +11²

=490000- 15400 + 121 = 474721

(iii) (891)² = (900-9)² = 900²- 2×900×9 +9²

= 810000- 16200 + 81 =793881