Question

Resolva as equações do 2° Grau, sendo U=/R A) 3(ײ-1)=4 B) 2(ײ-1)=ײ+7 C) 5(ײ-1)=(ײ+1) D) (×-3)(×+4)+8=×​

Answer 1

Resposta:

A) 3(ײ-1)=4

$3 {x}^{2} - 3 = 4 \\ 3 {x}^{2} - 3 - 4 = 0 \\ 3 {x}^{2} - 7 = 0$

B) 2(ײ-1)=ײ+7

$2 {x}^{2} - 2 = {x}^{2} + 7 \\ 2 {x}^{2} - 2 - {x}^{2} - 7 = 0 \\ {x}^{2} - 9 = 0$

C) 5(ײ-1)=(ײ+1)

$5 {x}^{2} - 5 = {x}^{2} - 1 \\ 5 {x}^{2} - 5 - {x}^{2} + 1 = 0 \\ 4 {x}^{2} - 4 = 0$

D) (×-3)(×+4)+8=×

${x}^{2} + 4x - 3x - 12 + 8 = x \\ {x}^{2} + x - 4 - x = 0 \\ {x}^{2} - 4 = 0$