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 …

Question

asked Jul 10, 2020 169k views

1 Answer

Taelsin · Answer 1 · 2020-07-13T16:24:28+0000

Answer:

Remember, for solve the quadratic equation

ax^2+bx+c=0

we use the quadratic formula

$x=(-b\pm√(b^2-4ac))/(2a)$

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