Question

3x² + 5x = -x – 9 + 2x²  

Answer 1

3x² + 5x = -x – 9 + 2x²

3x² + 5x + x - 2x² = – 9

x² + 6x = -9

x² + 6x + 9 = 0

Answer 2

3x²+5x=-x-9+2x²
3x²-2x²+5x+x+9=0
x²+6x+9=0

Fórmula resolvente x= -b+-√b²-4ac tudo a dividir por 2a

a= 1; b= 6; c= 9

x= -6+-√6²-4.1.9/2.1
x= -6+-√36-36/2
x= -6+-0/2
x= -6-0/2 ou x= -6+0/2
x= -6/2
x= -3