Bonsoir,
(2x - 8)² + (3x + 5) (3x - 5)
= 4x² - 32x + 64 + 9x² - 25
= 4x² + 9x² - 32x + 64 - 25
= 13x² - 32x + 39
(- 5x + 4) (2x - 5) - (2x - 8) + (4x - 7)
= - 10x² + 25x + 8x - 20 - 2x + 8 + 4x - 7
= - 10x² + 25x + 8x + 4x - 2x - 20 - 7 + 8
= - 10x² + 35x - 19
(3x + 5)² + 2x (4x - 2)
= 9x² + 30x + 25 + 8x² - 4x
= 9x² + 8x² + 30x - 4x + 25
= 17x² + 26x + 25
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Bonsoir,
(2x - 8)² + (3x + 5) (3x - 5)
= 4x² - 32x + 64 + 9x² - 25
= 4x² + 9x² - 32x + 64 - 25
= 13x² - 32x + 39
(- 5x + 4) (2x - 5) - (2x - 8) + (4x - 7)
= - 10x² + 25x + 8x - 20 - 2x + 8 + 4x - 7
= - 10x² + 25x + 8x + 4x - 2x - 20 - 7 + 8
= - 10x² + 35x - 19
(3x + 5)² + 2x (4x - 2)
= 9x² + 30x + 25 + 8x² - 4x
= 9x² + 8x² + 30x - 4x + 25
= 17x² + 26x + 25