## anonymous 5 years ago I NEED MAJOR HELP WITH QUADRATIC EQUATIONS

1. anonymous

y= -x^2+2x-1

2. anonymous

3. anonymous

I dont know it! I dnt understand it i need major help makes no sence

4. anonymous

It is $(-b \pm \sqrt{b ^{2}-4ac})\div2a$ where a,b,c are the constants in ax^2+bx+c