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Well, something good to keep in mind when it comes to polynomials, is that their standard form is always formed in decresing number of the exponent for "x", meaning if we have this: \[-2x^2(-5x^2+4^3)\] if we apply the distributive: \[10x^4-(4^3)(2x^2)\] Now, \(4^3=64\) so we can just replace it: \[10x^4-128x^2\] now, how do we transform this into a standard form? Well easy, you leave no parenthesis, and no other mathematical operation unsolved and then you write the terms of "x" with decresing number of exponent, so, the highest one is "4" which is held by \(10x^4\) this means that it should be first, and then we can write the rest in decresing form, which is \(-128x^2\) because the "x" has an exponent of "2": \[10x^4 -128x^2\] is the standard form of the given expression.
it was actually -8x^5+10x^4
ah, I see, make sure you write the problem properly before expecting any help. But even though, the process is exactly as described it.