Step-by-step explanation:
The ratio of the two shorter legs of the top triangle is

The bottom triangle has the following ratio:

Since their ratios are the same, this means that the two triangles are similar.
2x² - 128
2(x² - 64), but (x² - 64) = x² - 8² (difference of 2 squares),[a²-b²=(a-b)(a+b)]
2(x² - 64) = 2(x² - 8²) = 2(x-8)(x+8)
Answer:
40/7 = 5 5/7
Step-by-step explanation: