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Sagot :

(2x+3)² - (x+1)² =( 4x² + 9 ) - (x² +1) = 4x² +9 -x² -1 = 3x² + 8 

 (jsui pas sur)

(2x+3)² - (x+1)²

=(2x+3) * (2x+3)-(x+1)*(x+1)

=( 4x² + 9 ) - (x² +1)

= 4x² +9 -x² -1

= 3x² + 8 

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