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solve for u, where u is a real number. square root of u+7=9 if there is more than one solution, separate them with commas.
if there is no solution, click on "no solution".

i just need to know if i am right. i got u= square root of 2 and it could be both + or -

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.