Lingkaran_
(x + 2)² + (y - b)² = 9
P1(-2,b)
r1 = 3
x² + y² = 16
P2(0,0)
r2 = 4
bersinggungan luar → r1 + r2 = 7
Jarak P1 dan P2 = r1 + r2
√((-2 - 0)² + (b - 0)²) = 7
4 + b² = 49
b² = 45
b = ± √45 = ± 3√5
Nilai b :
3√5 atau -3√5
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Lingkaran_
(x + 2)² + (y - b)² = 9
P1(-2,b)
r1 = 3
x² + y² = 16
P2(0,0)
r2 = 4
bersinggungan luar → r1 + r2 = 7
Jarak P1 dan P2 = r1 + r2
√((-2 - 0)² + (b - 0)²) = 7
4 + b² = 49
b² = 45
b = ± √45 = ± 3√5
Nilai b :
3√5 atau -3√5