## anonymous 4 years ago the following formula is used to solve which of the following equations?

1. anonymous

|dw:1327795967224:dw| a.y=3x^2+9x-5 b.y=9x^2-5x+3 c.y=-5x^2+3x+9 d.y=3x^2-5x+9

2. Akshay_Budhkar

ok do u know the quadratic formula for an equation$ax^2+bx+c=0$ is$x={{-b \pm \sqrt {b^2-4ac}}\over 2a}$

3. anonymous

yes

4. anonymous

d. $$y=3x^2-5x+9$$

5. Akshay_Budhkar

So all you need to do is compare both the formula. you get$a=3,b=-5,c=9$