Question

If the sum and product of the zeros of the polynomial ax2+5x+c

Answer 1

X1,X2= 5/(2a)+/- sqrt(25-4ac)/(2a)

X1+X2=10

X1*X2=10

X1=10-X2

(10-X2)X2=10

X2^2-10X2+10=0

X2=10/2×/-sqrt(60)/2=5/(2a)- sqrt (25-4ac)/(2a)

X1=10-10/2-/+sqrt (60)/2=5/(2a)+sqrt (25-4ac)/(2a)

X1=5-/+sqrt(60)/2=5(2a)-/+sqrt (25-4ac)/2a

5=5/(2a)a=1/2

60=25-4ac.35=-4(1/2)c 35/2=-c or c= -17

doesn't work ! keep on trying.....