Question

x square -9x+3=0 find the sum and roots of the quadratic equations​

Answer 1

Answer:

D= b²-4ac

= (-9)²-4(1)(3)

= 81-12

=69

x= -(-9)+√69 / 2

x=9+√69 / 2. or x =9-√69 / 2 : roots of equation

sum of roots: -b/a

(9+√69/2) + (9-√69/2)= -(-9) /1

9+√69+9-√69 / 2. = 9

after cancelation √69 because it has opp sign

9+9 /2 =9

81 /2 =9

9 =9

thus it shows the relation with quadratic equation and it prove that it is right

the sum of roots is 9