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$x+3x-(4x^2)-x$

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Add and subtract polynomials

Full solution

Q.

x+3x-(4x^2)-x

Combine like terms: Combine like terms $x$ , $3x$ , and $-x$ . $x + 3x - x = 3x + x - x = 3x$
Distribute negative sign: Distribute the negative sign to $-4x^2$ . $\newline$ $-(4x^2) = -4x^2$
Combine results: Combine the results from step $1$ and step $2$ . $3x - 4x^2$

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