Question

Please jwb akan kutandai sbagai jwban terbaik

Answer 1

3. 5x+(-6x)+(-7x)
=5x-6x-7x
=-x-7x
. = -8x
4. (6k²+5k-8) - (5k²+7k+3)
= 6k²-5k²+5k-7k-8-3
= k²-2k-11
5. 10(a+b) - 2(3a-4b)
= 10a+10b-6a+8b
=10a-6a+10b+8b
= 4a+18b

Answer 2

1. 5x + (-6x) + (-7x)
= 5x + (-13x)
= - 8x

2. 6k² + 5k - 8 - (5k² + 7k + 3)
= (6k² - 5k²) + (5k - 7k) - (8 + 3)
= k² - 2k - 11
= (k - 2√3-1)    V     (k + 2√3-1)  ⇒ Akan dipelajari di klas 10 SMA (hanya sekedar ilmu)

3. 10 (a + b) - 2 (3a - 4b)
= 10a + 10b - 6a + 8b
= 4a + 18 b