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√(5a) + 2√(80a) - 7√(125a)
first square the whole equation
[√(5a)]2 + [2√(80a)]2 - [7√(125a)]2
when you square a sqrt the sqrt goes away
5a + 4 * 80a - 49 * 125a
dont forget to square the numbers outside the sqrts
5a + 320a - 6125a
just add and subtract
-5800a is your answer
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