Question

Show that (10a-7b)² + 280ab = (10a+7b)²

Answer 1

Answer:

Step-by-step explanation:

(10a-7b)^2= 100a²-140ab+49b² [(a+b)^2= a^2 + 2ab +b^2]

(10a-7b)² + 280ab = 100a²-140ab+49b²+ 280ab [280ab-140ab=140ab]

= 100a²+140ab+49b² can be written as (10a+7b)²

Hence Proved