mohon ya bantuannya yaa

4) 10x^2 -9x +2 = 0
a.c = 10×2 = 20
faktor 20 = -4 × -5 yang kalau dijumlahkan = -9
maka 10x^2 -9x +2 = 0
10x^2 -4x - 5x + 2 = 0
(10x^2 -4x) - (5x -2) = 0
2x( 5x -2) - (5x - 2) = 0
(2x -1)(5x -2) = 0
2x - 1 = 0 atau 5x -2 = 0
2x = 1 atau 5x = 2
x = 1/2 atau x = 2/5
5) 3, 6, 9, 12, 15, 18,
memiliki beda 3, maka 3 betikutmya adalah.
21, 24, 27
6) U7 = 41 dan U13 = 77
Un = a +(n-1)b
U7 = a + 6b = 41
U13= a + 12b = 77
------------------------- -
-6b = --36
b = -36/-6
b = 6
a + 6b = 41
a + 6.6 = 41
a + 36 = 41
a = 41 - 36 = 5
U10 = a + 9b
= 5 + 9.6
= 5 + 54
= 59
Jadi U10 = 59

smoga membantush_!

#dicek yaa :)