1) 11x^2 - 6x - 27 = 8x^2 - 6x;
11x^2 - 6x - 27 - 8x^2 + 6x=0
3x^2-27=0
3x^2=27
x^2=9
x=±3
2) -7x^2 + 13x + 9 = - 19 + 13x
-7x^2 + 13x + 9 + 19 - 13x = 0
-7x^2 + 28 = 0
-7x^2=-28
x^2=-28\(-7)
x^2=4
x=±2
1) 11x^2 - 6x - 27 = 8x^2 - 6x;
11x^2 - 6x - 27 - 8x^2 + 6x=0
3x^2-27=0
3x^2=27
x^2=9
x=±3
2) -7x^2 + 13x + 9 = - 19 + 13x
-7x^2 + 13x + 9 + 19 - 13x = 0
-7x^2 + 28 = 0
-7x^2=-28
x^2=-28\(-7)
x^2=4
x=±2