Tolong dong tentang himpunan, pakai cara ya yg ngebantu semoga mendapatkan phala tolong bangett

7. Ix-3I = 5
jawaban :
Ix-3I = 5
x-3 = 5
x = 5+3
x = 8
ATAU
Ix-3I = 5
x-3 = -5
x = -5+3
x = -2
HP {2,8}

8. -3 I5-yI = -6
Jawaban :
-3(5-y) = -6
-15+3y = -6
y = 3
ATAU
-3(5-y) = 6
-15+3y = 6
y = 7
HP{3,7}

9. I2x+16I = Ix+4I
Jawaban :
2x+16 = x+4
2x-x = 4-16
x = -12
ATAU
2x+16 = -x+4
2x+x = 4-16
x = -4

10. Ix+7I^2 - 3 Ix+7I - 4 = 0
Jawaban :
(x+7)(x+7) - 3(x+7) - 4 = 0
x^2 + 7x + 7x + 49 - 3x - 21 - 4 = 0
x^2 + 11x + 24 = 0
(x + 8) (x + 3) = 0
x = -8 Atau x = -3
HP{-8,-3}

Semoga membantu.. Tolong diperiksa kembali :)