4x^2-16x^2.
please solve
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4x^² - 16x^²
(2x)^² - (4x)^²
now it is in the form of (a^² - b^²)
( a+b)(a-b)
so, (2x+4x)(2x-4x)
6x*-2x
-12x^²
so 4x^² -16x^²= -12x^²
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