2 (-5) + (6)
= -10 + 6
= -4
8. Jika k penyelesaian 4 (3x – 6) = 3(2x-3) + 3
Maka nilai k – 9 = …
Pembahasan :
12 x – 2y = 6x – 9 + 3
12 x – 6x = -6 + 2y
6x = 18
x = 3
x = k sehingga :
k- 9
= 3 – 9
= -6
9. Sumbu simetri f(x) = 2x² + 3x + 5
Pembahasan :
2x² + 3x + 5
a b c
x = -b/2a
-3
= _____
2 (2)