Simplified it's 8y^2+40y+42
Answer:
42
Step-by-step explanation:
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I just took the test. The correct answer is:
The length of AE is 
Explanation:
From the figure, we can see that the two triangles ΔAED and ΔACB are similar. Thus, the legs of the triangle are proportional to each other.
Thus, we have,

Substituting the values of the sides from the image, we get,

Multiplying both sides of the equation by 6, we get,

Multiplying, we have,

Thus, the length of AE is 