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Sagot :
[tex]24x^2-45x-21=0
3(8x^2-15x-7)=0 /:3
8x^2-15x-7=0
a=8... b=-15.... c=-7
delta= b^2-4ac=449
x_1= \frac{15- \sqrt{449} }{16}
x_2= \frac{15+ \sqrt{449} }{16}
[/tex]√ΔΔΔΔΔΔΔΔΔ
[tex]24x^2-45x-21=0\\
3(8x^2-15x-7)=0\\
8x^2-15x-7=0\\
\Delta=(-15)^2-4\cdot8\cdot(-7)=225+224=449\\
\sqrt{\Delta}=\sqrt{449}\\
x_1=\dfrac{-(-15)-\sqrt{449}}{2\cdot8}=\dfrac{15-\sqrt{449}}{16}\\
x_2=\dfrac{-(-15)+\sqrt{449}}{2\cdot8}=\dfrac{15+\sqrt{449}}{16}[/tex]
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