8. If you were going to use the quadratic formula to solve the following equation and a = 9, what number would you use as the va
lue for the variable 'b'? 3x + 8 = 9x2 The variable 'b' = ____. (4.0 Points) Part 9 - - 0/1 Answered Questions, 4.0 Points
1 answer:
Answer:
Remember, for solve the quadratic equation
![ax^2+bx+c=0](https://tex.z-dn.net/?f=ax%5E2%2Bbx%2Bc%3D0)
we use the quadratic formula
![x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-b%5Cpm%5Csqrt%7Bb%5E2-4ac%7D%7D%7B2a%7D)
We have the equation
since a must be 9 then we pass the entire left side of the equation to the right side. We get the equation:
![3x+8=9x^2\\8=9x^2-3x\\0=9x^2-3x-8](https://tex.z-dn.net/?f=3x%2B8%3D9x%5E2%5C%5C8%3D9x%5E2-3x%5C%5C0%3D9x%5E2-3x-8)
Then, observe that a=9 and b=-3
You might be interested in
Answer:
190
Step-by-step explanation:
Answer: same side interior angles
Step-by-step explanation:
? 123456.789 ?????
then round2(123456.789)
=123456.79
Answer:
180 degrees Celsius
Step-by-step explanation:
I think it's correct
-3/11?
As the opposite of a positive is a negative