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A = a² + 6a + 9 - (a² + a + 5a + 5)
A = a² + 6a + 9 - a² - a - 5a - 5.......(Se van "a²")
A = 6a - a - 5a + 9 - 5
A = 5a - 5a + 9 - 5.........(Se van "5a)
A = 9 - 5
A = 4
B = a² + 8a + 16 − (a + 1) (a + 7)
B = a² + 8a + 16 - (a² + 7a + a + 7)
B = a² + 8a + 16 - a² - 7a - a - 7
B = a² + 8a + 16 - a² - 8a - 7.......(Se van "a²" y "8a")
B = 16 - 7
B = 9
Hallar: A–B ⇒ 4 - 9 ⇒ = -5