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mixer [17]
3 years ago
5

Correct and best explained answer gets brainliest. :)

Mathematics
2 answers:
kodGreya [7K]3 years ago
6 0
The question asks that y is equal to 0. So the equation should be 0 = x² - 64. Now you can use the addition property of equality by adding 64 to both sides. This gives you x² = 64. Now, to find x, you need to find the root of 64, which is √64. However this can be simplified to a whole number 8. However, this isn't it. The answer actually can be 8 or -8, because -8² = 64 as well, because a negative multiplied by a negative is a positive. So your answer would be B. 8 or -8. Hope this helps. Feel free to ask questions about my explanation or any other questions you have.
son4ous [18]3 years ago
3 0
Y = x^2 - 64
x^2 - 64 = 0
x^2 = 64
x^2 = 8^2
x = 8 and x = -8
answer is B. x = 8 and x = -8
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