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at which step are u confused ?

Shorter leg = x
longer leg = x+7
hypotenuse = x+7+1 = x+8
Do you know how to proceed now ?

no I don't know-how to continue

hartnn i dont know how to figure out what belongs to what leg

did u get @Aditi_Singh 's explanation ?

nope

Almost Correct , but x^2 + (x+7)^2 = (x+8)^2
Apply Pythagoras theorem!

:| , ofcourse it does makes sense. But here, your hypotenuse isn't (x+1) , it is x+8 ..

Im taking x as the longer leg, not the shorter one

Woohoo ;) High five for being right :D

High five ;) :D