Será a equação x² + 3x = x + 6 + x² do 2º grau?

x² + 3x = x + 6 + x²

-x²                      -x²  

      3x = x + 6

     -x   -x      

     2x =      6

      =      

      x =    3

x = 3

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225