Oblicz współrzedne punktów wspólnych:
a) okręgu (x-1)²+(y+2)²= 49 na osi x
b) okręgu x²+(y-5)²=169 osi y
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a)
(x-1)²+(y+2)²= 49
(x-1)²+(0+2)²= 49
(x-1)²+4= 49
(x-1)²= 45
x² - 2x + 1 - 45 = 0
x² - 2x - 44 = 0
Δ = 4 + 176 = 180
√Δ = 6√5
x1 = (2 - 6√5) / 2 = 1 - 3√5
x2 = (2 + 6√5) / 2 = 1 +3√5
b)
0²+(y-5)²=169
(y-5)²=169
(y-5)²=13²
y - 5 = 13 lub y - 5 = -13
y = 18 lub y = -8 ---------- odpowiedź
(x-1)²+(0+2)²=49
x²-2x+1+4-49=0
x²-2x-44=0
Δ=4+176
Δ=180
√Δ=6√5
x₁ = 1-3√5 y₁ = 0
x₂ = 1+3√5 y₂ = 0
0² + (y-5)² = 169
y²-10y+25-169 = 0
y²-10y-144 = 0
Δ = 100+576
Δ = 676
√Δ=26
y₁ = 18 x₁ = 0
y₂ = -8 x₂ = 0