Question

Solving Quadratics by Factoring

Solve x2 + 18 = –9x (Showwork for medal)

Answer 1

do u mean 2x? or x2...

Answer 2

x^2

Answer 3

x^2-9x+18
What two numbers would give you 18 if multiplied, but -9 if you add them?
18 | 2
9 | 3
3 | 3
1 |
Pick one and multiply two out of the right column and try.
2*9
3*6
That's it!
So -6*-3 = +18 and added -9
Therefore
(x-6)(x-3) is the solution.