Question

Solve 9x2 – 45x – 81 = 0.

Answer 1

Allybally, you need to learn to use the quadratic formula:
\[a x^2 +bx +c=0\] has solutions
\[ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]

Answer 2

first divide thru by 9
x^2 - 5x - 9 = 0
now use quadrtic formula to find the roots

Answer 3

Now just plug and chug

Answer 4

Of course, you should always try to factor it first, but it seems like the questions you are getting will not factor well.

Answer 5

right - it wont factor - but first dividing by 9 makes the calculation easier

Answer 6

can you help me on my other posts please