Mathematics: Need help with this question

Need help with this question - id9761092, Kayteeortiz4593

shelbycg02

13.02.2022

1. He added 5 instead of subtracted 5.

2. He should have subtracted 5.

3. 2 2/3

Step-by-step explanation:

3x+5=13

subtract 5 to both sides 3x=8

divide both sides by 3 x=8/3 or 2 2/3

0,0(0 оценок)

miarobless12389

17.04.2020

$\text{C. }\pm \frac{1}{2}$

Step-by-step explanation:

Start by moving the 2 to the right (so we can multiply both sides by the denominator):

$\frac{1}{2x^2-1}=-2$

Multiply both sides by 2x^2-1 :

$1=-2(2x^2-1),\\1=-4x^2+2$

Move everything to one side:

$4x^2-2+1=0,\\4x^2-1=0,\\4x^2=1,\\x^2=\frac{1}{4},\\x=\boxed{\pm\frac{1}{2}}$

0,0(0 оценок)