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URGENT! When we solve (cos²x - 1 = 0) by adding and taking the square root, how come we get the same answer when we factor (cos²x - 1) and use the zero product property to find the solution?
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URGENT! When we solve (cos²x - 1 = 0) by adding and taking the square root, how come we get the same answer when we factor (cos²x - 1) and use the zero product property to find the solution?

User Alex Kelly
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5 votes

Answer:

It is the same answer because you still have the same x-1 and he exponent of 2. It doesn't matter about the zero unless you are trying to find the angle of a triangle.

Explanation:

User Mike Wodarczyk
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