First of all, this isn't an equation. There's no equal sign, so it's just an expression.
9x^2-27xy
9x(x-3y)
This is now factored. I pulled out the greatest common factor:)
Since the areas are the same (5 x 6 = 30 units), and the height of the triangle (DC) is 5 so the length of the triangle must be 12. (1/2 of 5 x 12 is also 30)
So now we use the Pythagorean theorem
a² + b² = c² we have 5² + 12² = c² or 25 + 144 = c² or 169 = c²
The square root of 169 is 13 so side DE is 13 units.
Answer:x=1,-9
Step-by-step explanation:
