Question

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 value for the variable 'b'? 3x + 8 = 9x2 The variable 'b' = ____. (4.0 Points) Part 9 - - 0/1 Answered Questions, 4.0 Points

Answer 1

Answer:

Remember, for solve the quadratic equation

$ax^2+bx+c=0$

we use the quadratic formula

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

We have the equation $3x+8=9x^2$ since a must be 9 then we pass the entire left side of the equation to the right side. We get the equation:

$3x+8=9x^2\\8=9x^2-3x\\0=9x^2-3x-8$

Then, observe that a=9 and b=-3