a)F = ( 3x - 5)² - ( 3x - 5)(x+4).
f = 9x²-30x+25 -(3x²+12x-5x-20)
f =9x²-30x+25-3x²-7x+20
f = 6x²-37x+45
b)F = ( 3x - 5)² - ( 3x - 5)(x+4).
(3x-5)(3x-5-x-4)
(3x-5)(2x-9)
c)
F = ( 3x - 5)² - ( 3x - 5)(x+4).
6x²-37x+45
pour x =1
6(1)²-37(1) +45
6-37+45
51-37
=14
pour x =4.5
6(4.5)²-37(4.5) +45
6(20.25) -166.5+45
121.5+45 -166.5
166.5-166.5
=0
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a)F = ( 3x - 5)² - ( 3x - 5)(x+4).
f = 9x²-30x+25 -(3x²+12x-5x-20)
f =9x²-30x+25-3x²-7x+20
f = 6x²-37x+45
b)F = ( 3x - 5)² - ( 3x - 5)(x+4).
(3x-5)(3x-5-x-4)
(3x-5)(2x-9)
c)
F = ( 3x - 5)² - ( 3x - 5)(x+4).
6x²-37x+45
pour x =1
6(1)²-37(1) +45
6-37+45
51-37
=14
pour x =4.5
6(4.5)²-37(4.5) +45
6(20.25) -166.5+45
121.5+45 -166.5
166.5-166.5
=0