X² - 49 = 0
X²= 49
X= ± √49
X= ± 7
S= ( 7 , - 7)
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X² = 49
X²=√49
X= + - 7
X² - 49 = 0
X²= 49
X= ± √49
X= ± 7
S= ( 7 , - 7)