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Sagot :
[tex]\\ \rm\bull\rightarrowtail x^2-3x+27=6x+7[/tex]
[tex]\\ \rm\bull\rightarrowtail x^2-3x-6x+27-7=0[/tex]
[tex]\\ \rm\bull\rightarrowtail x^2-9x+20=0[/tex]
[tex]\\ \rm\bull\rightarrowtail x^2-5x-4x+20=0[/tex]
[tex]\\ \rm\bull\rightarrowtail x(x-5)-4(x-5)=0[/tex]
[tex]\\ \rm\bull\rightarrowtail (x-4)(x-5)=0[/tex]
[tex]\\ \rm\bull\rightarrowtail x=4,5[/tex]
♪Answer :
»x² - 3x + 27 = 6x + 7
- ax² + bx + c = 0
»x² - 3x + 27 - 6x - 7 = 0
»x² - 9x + 20 = 0
»(x - 4)(x - 5) = 0
»(x - 4) = 0 V (x - 5) = 0
- For [tex]\tiny x_1[/tex]
»x - 4 = 0
»x = 0 + 4
»x = 4
- For [tex]\tiny x_2[/tex]
»x - 5 = 0
»x = 0 + 5
»x = 5
- x = {x| 4 or 5, x€R}
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