Diasy

Solve similar right triangles find lenght AE issue

I have tried using the hints to understand but i don't. I don't get where that +(4.2)^2 in hint 4 is coming from, or how you get to the next step.> (AE)^2+8.4(AE)=576> (AE)^2+8.4(AE)+(4.2)^2 = 576+...

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