Bonsoir,
b) ax + b = 0
ax = 0 - b
x = (- b)/a
c) → 2x + 8 = 0
x = -8/2 = -4
→ 3x - 1 = 0
⇔ 3x + (-1) = 0
x = -(-1)/3 = 1/3
→ 11x + 1 = 0
x = -1/11
→ 2 - 7x = 0
2 + (-7x) = 0
x = -2/-7 = 2/7
→ 7x + 8 = 0
x = -8/7
→ 2,8 - 4x = 0
⇔ 2,8 + (-4x) = 0
x = -2,8/-4 = 2,8/4 = 0,7
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Bonsoir,
b) ax + b = 0
ax = 0 - b
x = (- b)/a
c) → 2x + 8 = 0
x = -8/2 = -4
→ 3x - 1 = 0
⇔ 3x + (-1) = 0
x = -(-1)/3 = 1/3
→ 11x + 1 = 0
x = -1/11
→ 2 - 7x = 0
2 + (-7x) = 0
x = -2/-7 = 2/7
→ 7x + 8 = 0
x = -8/7
→ 2,8 - 4x = 0
⇔ 2,8 + (-4x) = 0
x = -2,8/-4 = 2,8/4 = 0,7