Question

verify the property X × Y = Y× X for X = 7/9 ,Y = 2/21​

Answer 1

Answer:

Commutative property

Step-by-step explanation:

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Answer 2

Answer:

a

2

−1)(b

2

−1)+4ab

=a

2

b

2

−a

2

−b

2

+1+2ab+2ab

=(ab)

2

+2(ab)(1)+1

2

−(a

2

−2ab+b

2

)

=(ab+1)

2

−(a−b)

2

=(ab+1+a−b)(ab+1−a+b)