please solve question number 1 (iii)part
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Given
(a²-b²) = (a+b) (a-b)
(a-b) ²=a²+b²-2ab
(a+b)²=a²+b²+2ab
Then put the values...
(a+b) (a-b) - a²+b²-2ab - a²+b²+2ab
-2ab and 2ab will cut
(a+b) (a-b) - 2(a²+2b²)
(a+b)(a-b)-2(a²+b²)
-2(a²-b²)(a²+b²)
-2[(a²)²-(b²)²]
Answer is - 2(a⁴-b⁴)
(a²-b²) = (a+b) (a-b)
(a-b) ²=a²+b²-2ab
(a+b)²=a²+b²+2ab
Then put the values...
(a+b) (a-b) - a²+b²-2ab - a²+b²+2ab
-2ab and 2ab will cut
(a+b) (a-b) - 2(a²+2b²)
(a+b)(a-b)-2(a²+b²)
-2(a²-b²)(a²+b²)
-2[(a²)²-(b²)²]
Answer is - 2(a⁴-b⁴)
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