Makakuha ng mabilis at maaasahang mga sagot sa IDNStudy.com. Sumali sa aming platform ng tanong at sagot upang makatanggap ng mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

how to determine a quadratic equation given the sum,product and roots?






Sagot :

if x₁ & x₂ are the roots of the quadratic equation  ax² +bx+c=0
then        x₁+x₂ =  -b/a          &  x₁x₂  =  c/a
to form the equation use this pattern
   x² - (sum of roots)x + (product of roots) =0
ex:  write a quadratic whose roots are  2 & -5
solution
x₁+x₂  =      2 + (-5)  = -3        sum of roots
x₁x₂      =      2*-5      -10         product of roots
so the equation is            x²+3x -10=0
note the change from negative to positive of the sum of roots sign