Respuestas
Respuesta:21
Explicación paso a paso:
Simplify the following:
(x + 8) (x + 4) - (x + 4) (x + 5) - 3 (4 x - 3) + 9 x
(x + 4) (x + 8) = (x) (x) + (x) (8) + (4) (x) + (4) (8) = x^2 + 8 x + 4 x + 32 = x^2 + 12 x + 32
x^2 + 12 x + 32 - (x + 4) (x + 5) - 3 (4 x - 3) + 9 x
(x + 4) (x + 5) = (x) (x) + (x) (5) + (4) (x) + (4) (5) = x^2 + 5 x + 4 x + 20 = x^2 + 9 x + 20
32 + 12 x + x^2 - x^2 + 9 x + 20 - 3 (4 x - 3) + 9 x
-(x^2 + 9 x + 20) = -x^2 - 9 x - 20
32 + 12 x + x^2 + -x^2 - 9 x - 20 - 3 (4 x - 3) + 9 x
-3 (4 x - 3) = 9 - 12 x
32 + 12 x + x^2 - 20 - 9 x - x^2 + 9 - 12 x + 9 x
Agrupando terminos
32 + 12 x + x^2 - 20 - 9 x - x^2 + 9 - 12 x + 9 x = (32 - 20 + 9) + (12 x - 9 x - 12 x + 9 x) + (x^2 - x^2)
(32 - 20 + 9) + (12 x - 9 x - 12 x + 9 x) + (x^2 - x^2)
32 - 20 + 9 = 21
21 + (12 x - 9 x - 12 x + 9 x) + (x^2 - x^2)
12 x + (-9 x - 12 x + 9 x) = 0
(x^2 - x^2) + 21
x^2 - x^2 =0
Respuesta
21