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(2a + 3)² - (a - 5)²
(2a + 3 - a + 5)(2a + 3 + a - 5)
(a + 8)(3a - 2)
⇒ 3a² + 22a - 16
Nomor 17
9x² - 64
(3x)² - 8²
⇒ (3x - 8)(3x + 8)
Nomor 18
x² + 12x + 20
x² + 2x + 10x + 20
x(x + 2) + 10(x + 2)
⇒ (x + 2)(x + 10)
Nomor 19
3a² + 11a + 6
3a² + 9a + 2a + 6
3a(a + 3) + 2(a + 3)
⇒ (a + 3)(3a + 2)
Nomor 20
6y² + 2y - 20
6y² + 12y - 10y - 20
6y(y + 2) - 10(y + 2)
⇒ (6y - 10)(y + 2)
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