Question

Use the quadratic formula to find both solitions to the quadratic equation given below x^2+6×=16

Answer 1

x1=4

x2=-8

Explanation:

x^2+6x-16=0

a=1 b=6 c=-16

D=b^2 - 4ab= 36+64=100

D>0, 2 sqrt

x1= -b+sqrt{D} /2= -6+10/2= 4

x2= -b-sqrt{D} /2= -6-10/2= -8

(That's what we were taught!)