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Jabarkan. x^2 + (x + 5) (x + 1), (a + 4)^2 – (a – 2) (a + 2)

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Jabarkan.
1. x2 + (x + 5) (x + 1).
2. (a + 4)2 – (a – 2) (a + 2)
3. (+2) (y – 7) – y (y – 4)
4. 2(x – 1)2 – (2x – 1)2.

x2 + (x + 5) (x + 1)
x2 + x2 + x + 5x + 5
2x2 + 6x + 5

Jadi x2 + (x + 5) (x + 1) = 2x2 + 6x + 5.


(a + 4)2 – (a – 2) (a + 2)
(a2 + 8a + 16) – (a2 – 4)
a2 + 8a + 16 – a2 + 4
8a + 20

Jadi (a + 4)2 – (a – 2) (a + 2) = 8a + 20.


(+2) (y – 7) – y(y – 4).
(2y – 14) – (y2 – 4y)
2y – 14 – y2 + 4y
-y2 + 6y – 14.

Jadi (+2) (y – 7) – y(y – 4) = -y2 + 6y – 14.


2(x – 1)2 – (2x – 1)2.
2(x2 – 2x + 1) – (4x2 – 4x + 1)
2x2 – 4x + 2 – 4x2 + 4x – 1
-2x2 + 1.

Jadi, 2(x – 1)2 – (2x -1)2 = -2x2 + 1.

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