1. x^2 + x - 210 = 0 2. x^2 - x - 600 = 0 3. x (x - 6) = 40 4. 7x^2 = 5x

1. x^2 + x - 210 = 0
→ (x + 15)(x - 14) = 0
→ x = -15 atau x = 14

2. x^2 - x - 600 = 0
→ (x - 25)(x + 24) = 0
→ x = 25 atau x = -24

3. x(x - 6) = 40
→ x^2 - 6x - 40 = 0
→ (x - 10)(x + 4) = 0
→ x = 10 atau x = -4

4. 7x^2 = 5x
→ 7x^2 - 5x = 0
→ x(7x - 5) = 0
→ x = 0 atau x = 5/7

maaf kalau salah
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