Question

1. Expand these identity a-b3, a? - b2
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Answer 1

(a-b)³

a³-b³-3ab(a+b)

a²-b²

(a+b)(a-b)

Answer 2

Answer:

Step-by-step explanation:

= a2 - 2ab + b2. Therefore, (a + b)2 + (a - b)2. = a2 + 2ab + b2 + a2 - 2ab + b2.

= 2(a2 + b2), and. (a + b)2 - (a - b)2. = a2 + 2ab + b2 - {a2 - 2ab + b2}

= 4ab. Corollaries: (i) (a + b)2 - 2ab = a2 + b2.