|4r+7|=43

解

∣ 4 r + 7 ∣ = 43

r = - \frac{25}{2} or r = 9

十進法表記

r = - 12.5, r = 9

解答ステップ

∣ 4 r + 7 ∣ = 43

絶対規則を適用する:

∣ u ∣ = a, a > 0

の場合は

u = a

u = - a

4 r + 7 = - 43 or 4 r + 7 = 43

4 r + 7 = - 43 or 4 r + 7 = 43

r = - \frac{25}{2} or r = 9