a² - 4 = 0
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vj63281:
a2-4=0 a2=4 a= -2 or a=2
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a² - 4 = 0
By using ID> a² - b² = (a+b) (a-b)
(a)² - (2)² = 0
(a + 2) (a - 2) = 0
therefore,
a + 2 = 0
a = -2
a - 2 = 0
a = 2
By using ID> a² - b² = (a+b) (a-b)
(a)² - (2)² = 0
(a + 2) (a - 2) = 0
therefore,
a + 2 = 0
a = -2
a - 2 = 0
a = 2
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