Question

among the following this is not a identitt

1)
$a {}^{2} - b = (a - b)(a -b)$
2)
$(a - b) {2} = a - 2ab + b {}^{2}$
3)
$a(a - 2) = a {}^{2} + 2a$
4)
$a + b = 10$


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Answer 1

Answer:

No.4) a+b= 10 is not an identity

Answer 2

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ANSWER = { 3 } a ( a - 2 ) = a {} ^{2} + 2a