Bonsoir,
A(x)=(2x-3)(5x-4)
A (x) = 10x² - 8x - 15x + 12
A (x) = 10x² - 23x + 12
B(x)=2x(5x-3)-7
B (x) = 10x² - 6x - 7
C(x)=3x-(x-1)-(x+7)(x+3)
C (x) = 3x - x + 1 - (x² + 3x + 7x + 21)
C (x) = 3x - x + 1 - x² - 3x - 7x - 21
C (x) = - x² + 3x - 3x - x - 7x + 1 - 21
C (x) = - x² - 8x - 20
D(x)=(x+5)²
D (x) = x² + 10x + 25
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Bonsoir,
A(x)=(2x-3)(5x-4)
A (x) = 10x² - 8x - 15x + 12
A (x) = 10x² - 23x + 12
B(x)=2x(5x-3)-7
B (x) = 10x² - 6x - 7
C(x)=3x-(x-1)-(x+7)(x+3)
C (x) = 3x - x + 1 - (x² + 3x + 7x + 21)
C (x) = 3x - x + 1 - x² - 3x - 7x - 21
C (x) = - x² + 3x - 3x - x - 7x + 1 - 21
C (x) = - x² - 8x - 20
D(x)=(x+5)²
D (x) = x² + 10x + 25