Recall that in a 30 – 60 – 90 triangle, if the shortest leg measures x units, then the longer leg measures x units and the hypotenuse measures 2x units

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Given right triangle a w/a hypotenuse length of x+4 and a leg of x, and right triangle b, w/ a hypotense length of 3y and a leg length of y+4 for what values of x and y are the triangles congruent by hl?

What is the expression equivalent to (3x^2-7)