Use the quadratic formula to solve x^2 + 7x + 8 = 0. Estimate irrational numbers to the nearest tenth.

A. {-12, 5}
B.{-11.1, -2.9}
C. {-5.6, -1.4}
D. {-3.9, 12.1}

Question

Use the quadratic formula to solve x^2 + 7x + 8 = 0. Estimate irrational numbers to the nearest tenth.

A. {-12, 5}
B.{-11.1, -2.9}
C. {-5.6, -1.4}
D. {-3.9, 12.1}

photon336 · Answer

We need to use this formula here 

$$-b \pm \frac{ \sqrt{b^{2}-4ac} }{ 2a }$$

photon336 · Answer

$$x^{2}+7x+8 = 0$$

$$ax^{2}+bx+c$$

so basically a would be the number in front of x^{2} 
b is the number in front of x. 
and c is the last number 

so a would be 1
b would be 7
and c 8

try plugging these numbers into the equation and then tell me what you get