B = 2x * 2 + 3 * 2 - (x² - 7²)
B = 4x + 6 - (x² - 49)
B = 4x + 6 - x² + 49
B = -x² + 4x + 6 + 49
B = -x² + 4x + 55
D = (x-5)*2 -(2x+7)(x-5)
D = (x-5)(2-(2x+7))
D = (x-5)(2-2x-7)
D = (x-5)(-2x-5)
D = x*(-2x) +x*(-5) -5*(-2x) - 5 * (-5)
D = -2x² - 5x + 10x + 25
D = -2x² + 5x + 25
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Bonsoirb ) 4 x² + 12 x +9 - ( x² - 49)
b = 4 x² +12 x + 9 - x² + 49
b = 3 x² + 12 x + 58
d = x² - 10 x + 25 - 2 x² - 10 x - 7 x + 35
d = - x² - 27 x + 60
B = 2x * 2 + 3 * 2 - (x² - 7²)
B = 4x + 6 - (x² - 49)
B = 4x + 6 - x² + 49
B = -x² + 4x + 6 + 49
B = -x² + 4x + 55
D = (x-5)*2 -(2x+7)(x-5)
D = (x-5)(2-(2x+7))
D = (x-5)(2-2x-7)
D = (x-5)(-2x-5)
D = x*(-2x) +x*(-5) -5*(-2x) - 5 * (-5)
D = -2x² - 5x + 10x + 25
D = -2x² + 5x + 25