Question

Resolva as equações incompleta em b
2x2_72=0
3x2_6=0
9x2_16=0
X2_64=0

Answer 1

Resposta:

2x²-72=0

2x²=72

x²=72/2

x²=36

x=+/-raiz 36

x=+/-6 // x1=-6 e x2=6

$3x {}^{2} - 6 = 0 \\ x {}^{2} = \frac{6}{3} \\ x {}^{2} = 2 \\ x = + - \sqrt{2} \\ x1 = - \sqrt{2} \: e \: x2 = \sqrt{2} \\ \\ 9x {}^{2} - 16 = 0 \\ x {}^{2} = \frac{16}{9} \\ x = + - \sqrt{ \frac{16}{9} } \\ x = + - \frac{4}{3} \\ x1 = - \frac{4}{3} \: e \: x2 = \frac{4}{3} \\ \\ x {}^{2} - 64 = 0 \\ x {}^{2} = 64 \\ x = + - \sqrt{64} \\ x = + - 8 \\ x1 = - 8 \: e \: x2 = 8$