The value of x that will make the lines parallel is 8
Corresponding angles
If the line m and n are parallel to each other hence the given angles will be corresponding angles.
Since they are corresponding angles, hence:
2x² = 128
x² = 128/2
x² = 64
x = √64
x = 8
Hence the value of x that will make the lines parallel is 8
Learn more on corresponding angles, here: https://brainly.com/question/2938476
