The sum would be
4x^2-x+1
add like terms.
3x^2+x^2
4x^2
4x+-5x
-x
3-2
1
4x² - x + 1
summing gives :
3x² + 4x - 2 + x² - 5x + 3 ( collect like terms )
(3x² + x² ) + (4x - 5x ) + ( - 2 + 3 )
= 4x² - x + 1
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