Jhaycidn
Answered

IDNStudy.com, ang iyong destinasyon para sa maaasahan at pangkomunidad na mga sagot. Ang aming komunidad ay handang magbigay ng malalim at praktikal na mga solusyon sa lahat ng iyong mga katanungan.

x^2-5x+10=0 . is it a quadratic or not?explain?

Sagot :

Yes,it's a quadratic ecuation because it has the general form of a second grade ecuation which is:

[tex]ax^2+bx+c[/tex]

We have the unknown therm raised at the second power x^2 = ax^2   => a=1
So,we would solve the quadratic ecuation:

[tex]x^2-5x+10=0 \\\\ a=1 \\ b=-5 \\ c=10 \\\\ \Delta= b^2-4ac= (-5)^2-4*1*10= 25-40\to \boxed{-15} \ \textless \ 0 \\ \Delta \ \textless \ 0 \\ a\ \textgreater \ 0 \\\\ -\frac{b}{2a}\to \frac{5}{2} \\\\ -\frac{\Delta}{4a}\to\frac{15}{4}[/tex]


We do the sign table
      x       |-                   [tex]\frac{5}{2}}[/tex]                   +   
x²-5x+10|+∞      ↓          [tex]\frac{15}{4}[/tex]        ↑        +∞

[tex]S=(-\infty; \frac{5}{2}] \ \cup \ [\frac{5}{2};\infty)[/tex]