exercise 2.
Product of the sum and difference of two terms.
find the product of the following:

1.(×-5)(×+5)
2.(3×+7)(3×-7)
3.(4×-7)(4×+7)
4.(3a+b)(3a-b)
5.(×+15)(×-15)
6.(2ײ+3)(2ײ-3)
7.(×-y)(×+y)
8.(a²+b²)(a²-b²)
9.(2a-b)(2a+b)
10.(2×-3)(2×+3)
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