1. x^2 - 9 = 0
x^2 = 9
√x^2 = √9
x = +-3
2. x^2 - 10x + 16 = 0
(x-8) (x-2)
x = 8
x = 2
3. x^2 + 3x = 10
x^2 + 3x + 9/4 = 10 + 9/4
(x+3/2)^2 = 49/4
x = -5
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Answers & Comments
1. x^2 - 9 = 0
x^2 = 9
√x^2 = √9
x = +-3
2. x^2 - 10x + 16 = 0
(x-8) (x-2)
x = 8
x = 2
3. x^2 + 3x = 10
x^2 + 3x + 9/4 = 10 + 9/4
(x+3/2)^2 = 49/4
x = -5
x = 2