10 because if a is 6 2a will be 12, takeaway 2 will be 10!
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2a - a = a
2a = 35 a = 35/2 a = 17.5
n(2a - b)(2a + b)(4a^2 - 2ab + b^2)(4a^2 + 2ab + b^2)
2(a+b) is 2a plus 2b in factored form.
a x a means that a is multiplied by a. 2a means that a is multiplied by 2. Unless a happens to be 2, a x a will give a different result.The difference is a x (a-2). for example if a = 2, then the difference is zero. If a = 3, the difference is 3The operators are different: 2a = a + a (addition).