Completing the square. a^2+2a-3=0
1 answer:
a^2 + 2a - 3 = 0
a^2 + 2a = 3
a^2 + 2a + 1 = 3 + 1 (I added a 1 to both sides)
a^2 + 2a + 1= 4
(a + 1)^2 = 4
a = -3, 1
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