(x-8)^2=25
x-8=√25
x-8=±5
x-8=5
x=8+5
×=13
x-8=-5
x=-5+8
x=3
S={3, 13}
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x² -2.x.8 + 8² = 25
x² -16x + 64 - 25 =
x² -16x + 39 = eq. do 2o. grau
Δ = b² - 4.a.c
Δ = (-16)² - 4.1.39
Δ = 256 - 156
Δ = 100
x = -b +- √Δ / 2a
x = -(-16) +- √100 / 2.1
x = 16 +- 10 / 2
x' = 16 +10 / 2 x'' = 16 -10 / 2
x' = 26 / 2 x'' = 6 / 2
x' = 13 x'' = 3
S = {13, 3}
(x-8)^2=25
x-8=√25
x-8=±5
x-8=5
x=8+5
×=13
x-8=-5
x=-5+8
x=3
S={3, 13}