✔ 最佳答案
2|2x - 3| - 5 = 25
To solve this, we first need to get the absolute value by itself. So in doing that, we get:
2|2x - 3| = 30
|2x - 3| = 15
Now solving this, removing the absolute value places a ± on the other side. Simple example:
|x| = 2
x = ±2
Since both -2 and +2 are solutions.
so doing that, we get:
2x - 3 = ±15
now solve for our two x's:
2x = 3 ± 15
2x = -12 and 2x = 18
x = -6 and x = 9
So to answer your question: is the answer x = 6 and x = 9? no. It is not.
The answer is:
x = -6 and x = 9
Testing the answers, we get:
2|2x - 3| - 5 = 25
2|2(-6) - 3| - 5 = 25 and 2|2(9) - 3| - 5 = 25
2|-12 - 3| - 5 = 25 and 2|18 - 3| - 5 = 25
2|-15| - 5 = 25 and 2|15| - 5 = 25
2(15) - 5 = 25 and 2(15) - 5 = 25
And now both equations are the same, so only simplifying it once:
30 - 5 = 25
25 = 25
TRUE
So both x = -6 and x = 9 are answers.