Which statement describes the graph of f(x) = 4x7 40x6 100x5? the graph crosses the x axis at x = 0 and touches the x axis at x = 5. the graph touches the x axis at x = 0 and crosses the x axis at x = 5. the graph crosses the x axis at x = 0 and touches the x axis at x = –5. the graph touches the x axis at x = 0 and crosses the x axis at x = –5.

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

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