Sagot :
(2x + 1 )² + (2 - x) ²
=4x²+4x+1+4-4x+x²
=5x²+5
(3x + 4 ) (3x -4 ) - 16
=9x²-16-16
=9x²-32
=4x²+4x+1+4-4x+x²
=5x²+5
(3x + 4 ) (3x -4 ) - 16
=9x²-16-16
=9x²-32
(2x + 1 )² + (2 - x) ²
= (2x)² + 2 x 2x x 1 + 1² + 2² - 2 x 2 x x + x²
= 4x² + 4x + 1 + 4 - 4x + x²
= 5x² + 5
(3x + 4 ) (3x -4 ) - 16
= (3x)² - 4² - 16
= 9x² - 16 - 16
= 9x² - 32
= (2x)² + 2 x 2x x 1 + 1² + 2² - 2 x 2 x x + x²
= 4x² + 4x + 1 + 4 - 4x + x²
= 5x² + 5
(3x + 4 ) (3x -4 ) - 16
= (3x)² - 4² - 16
= 9x² - 16 - 16
= 9x² - 32