If x2 = 30, what is the value of x? ±60 ±15 ±square root of 30 ±square root of 15
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yeah102720045
yeah102720045
09/04/2018
Mathematics
High School
answered
If x2 = 30, what is the value of x?
±60
±15
±square root of 30
±square root of 15
2
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sqdancefan
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Subtract 30, then factor the equation.
... x² = 30
... x² - 30 = 0
... (x -√30)(x +√30) = 0
By the zero product rule, the solutions are values of x that make a factor be zero.
... x - √30 = 0 . . . . the first factor is zero
... x = √30
... x + √30 = 0 . . . . the second factor is zero
... x = -√30
The solutions are . . .
... x = ±√30 . . . . . matches your 3rd choice
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