Question

$\huge\colorbox{lightgreen}{Answer:-} \\Find \: the \: sum \: of \: the \: following :- \\ {3x}^{3} - {5x}^{2} + 2x + 1,3x - {2x}^{2} - {x}^{3} , {2x}^{2} - 7x + 9$
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Answer 1

$\huge\colorbox{lgreen}{Answer:-}$

= 3x³ - 5x² + 2x + 1 + 3x - 2x² - x³ + 2x² - 7x + 9

= 2x³ - 5x² - 2x + 10

Answer 2

Answer :

$\sf {3x}^{3} - {5x}^{2} + 2x + 1,3x - {2x}^{2} - {x}^{3} , {2x }^{2} - 7x + 9$

$\sf {3x}^{3} - {5x}^{2} + 2x + 1 + 3x - {2x}^{2} - {x}^{3} + {2x }^{2} - 7x + 9 \\ \\ \sf = {3x}^{3} - {x}^{3} - {5x}^{2} - \cancel{{2x}^{2}} + \cancel{{2x}^{2}} + 2x + 3x - 7x + 1 + 9 \\ \\ \sf = {2x}^{3} - {5x}^{2} - 2x + 10$