Question

Reducir:
(a+11)(a+5)+(a–3)(a–2)+(a+9)(a–20)

Answer 1

(a + 11)(a + 5) + (a - 3)(a - 2) + (a + 9)(a - 20)=
a^2 + 16a + 55 + a^2 - 5a + 6 + a^2 - 11a - 180 =
3a^2 - 119

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