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Nomor 1.
Dengan:
x² = 64a², didapat x = √[64a²] = 8a
Lalu:
y² = 9, dan y = √9 = 3
Didapat:
(64a² - 9) = (8a+3)(8a-3)
Nomor 2.
Dengan:
x² = 25p², didapat x = √[25p²] = 5p
Lalu:
y² = 16q², didapat y = √[16q²] = 4q
Diperoleh:
25p² - 16q = (5p+4q)(5p-4q)
Nomor 3.
Dengan:
x² = 49, diperoleh x = √49 = 7
y² = p², diperoleh y = √p² = p
Sehingga:
49 - p² = (7+p)(7-p)