No, ab squared is not the same as 2ab.
ab squared (ab^2) means multiplying ab by itself, resulting in a^2 * b^2.
On the other hand, 2ab means multiplying 2 by a and then by b, resulting in 2ab.
These two expressions are not equivalent because ab^2 involves squaring the variable b, while 2ab does not involve squaring any variables.
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b2 + ab - 2 - 2b2 + 2ab = -b2 + ab - 2 which cannot be simplified further.
If, as is normal, ab represents a times b, etc then ab + ab + cc = 2ab + c2 which is generally not the same as abc.
-5ab + 7ab -9ab + ab -2ab ... Let's simplify that a bit:ab(-5+7-9+1-2) = -8ab
the answer to factorising (a x a3 + 2ab + b2) would be (a4+2ab+b2)
(a + b)² = a² + b². If you expand the left side, you have a² + 2ab + b² = a² + b². Subtracting a² and b² from both sides, you have: 2ab = 0. So if either a=0 or b=0 the equation is satisfied.