169 = x² + x + x + 1 + 9x²
169 = 10x² + 2x + 1
10x² + 2x + 1 = 169
10x² + 2x + 1 - 169 = 0
10x² + 2x - 168 = 0
Δ= 2² - 4 . 10 . -168
Δ= 4 + 6720
Δ= 6724
-2 +- √6724 / 2 . 10
-2 +- 82 / 20
x1= -2 -82 / 20
x1= -84 / 20
x1= -4,2
x2= -2 + 82 / 20
x2= 80 / 20
x2= 4
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169 = x² + x + x + 1 + 9x²
169 = 10x² + 2x + 1
10x² + 2x + 1 = 169
10x² + 2x + 1 - 169 = 0
10x² + 2x - 168 = 0
Δ= 2² - 4 . 10 . -168
Δ= 4 + 6720
Δ= 6724
-2 +- √6724 / 2 . 10
-2 +- 82 / 20
x1= -2 -82 / 20
x1= -84 / 20
x1= -4,2
x2= -2 + 82 / 20
x2= 80 / 20
x2= 4