- #1
late347
- 301
- 15
Homework Statement
[/B]
Solve without external aids. You may use memorized 2nd degree equation formula.
9(x-2)= 3x(x-2)
Homework Equations
3. The Attempt at a Solution [/B]
Use memorized 2nd degree equation formula
9x-18= 3x^2 -6x ]]] + 18
9x= 3x^2 -6x +18 ]]] -9x
0 = 3x2-15x + 18
After some tiresome calculation with pen-and-paper
I reached conclusion that
x is either
(15+3) /6 = 3
or
(15-3) / 6 = 2
x either 2 or 3
I wonder if there is an easier way to solve the equation with only mental arithmetic of course... (no calculator no formula sheet)