I'm trying to learn the quadratic formula and I understand it to about 90%. My problem is, I don't understand when should b (ax^2 +bx + c =0) be negative or positive with regards to using the quadratic formula. I took a picture and posted the link at the bottom. I Would like to know what I'm doing wrong. I know X= +5 and it should really be -5 but that's where I'm stuck. Thanks in advance.
http://postimg.org/image/s7t58usxn/
Hope the link works, if not, I'll try to type it in manually within 24hrs.
http://postimg.org/image/s7t58usxn/
Hope the link works, if not, I'll try to type it in manually within 24hrs.