Tolong jawab nomer 4,6,8 Dengan caranya!!!

4.
misal t = t shrit dan s = sweater
2t + s = 300.000
s - t = 60.000
kurangkan
3t = 240.000
t= 80.000

6.
Persamaan kuadrat  x² + 2x - p = 0
x1 = 5 --> 5² + 2(5) - p = -
25 + 10 - p= 0
p = 35

8.
x₁ = 1 -√5
x₂ = 1 + √5

x₁ + x₂ = 1 - √5 + 1 + √5 = 2
x₁. x₂  = (1 - √5)(1+ √5) = 1 - 5 = -4

Persamaan kuadrat  x² -(x₁+x₂) x + (x₁.x₂) = 0
x² - 2x - 4 = 0