Verified answer

Bonjour,

A= 2 (s+5) (s-5) + (4s+3)²

A = 2 (s² - 25) + 16s² + 24s + 9

A = 2s² - 50 + 16s² + 24s + 9

A = 2s² + 16s² + 24s - 50 + 9

A = 18s² + 24s - 41

B= (3x+4)²- (1-2x) (6+x)

B = 9x² + 24x + 16 - (6 + x - 12x - 2x²)

B = 9x² + 24x + 16 - 6 - x + 12x + 2x²

B = 9x² + 2x² + 24x + 12x - x + 16 - 6

B = 11x² + 35x + 10.

bonjour

A= 2 (s+5) (s-5) + (4s+3)²

A =  2 ( s² - 25 ) + 16 s² + 24 s + 9

A = 2 s² - 50 + 16 s² + 24 s + 9

A = 18 s² + 24 s - 41

B= (3 x+4)²- (1-2 x) (6+x)

B = 9 x² + 24 x + 16 - ( 6 + x - 12 x - 2 x²)

B = 9 x² + 24 x + 16 - 6 - x + 12 x + 2 x²

B = 11 x² + 35 x + 10