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Step-by-step explanation:
1. a²- b²
2. x²-(a-b)x-ab
Explanation of no. 2
(x-a)(x+b)
= x(x-b)+a(x+b)
= x²-bx+ax-ab
We can stop here, or continue by taking ‘x’ as common in the middle term. So, we get
= x²-(a-b)x-ab
Therefore, it is in the form of ax²-bx-c.
Therefore, the expansion form of (x-a)(x+b) is
x²-(a-b)x-ab.
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