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Forum: Homework Help 2019-09-28, 02:30
Replies: 13
Views: 6,394
Posted By VBCurtis
In every precalc & calculus curriculum I've seen,...

In every precalc & calculus curriculum I've seen, square root is a function. That means it has one solution, the positive one. Consider a graph of y = sqrt(x); it's the top arm of a sideways...
Forum: Homework Help 2019-09-27, 21:32
Replies: 13
Views: 6,394
Posted By VBCurtis
The square root of x^2 is |x|, not x. So the...

The square root of x^2 is |x|, not x.

So the square root of (-1)^2 is |-1|, not -1.

It's not OK to write sqrt(x^2) = sqrt(x) * sqrt (x) = x, but that's what you did for -1.
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