What is the answer to 1=|d-40| ?

The answer to 1=|d-40| is d=39\lor d=41

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1=|d-40|

1 = ∣ d - 40 ∣

d = 39 or d = 41

Solution steps

1 = ∣ d - 40 ∣

Switch sides

∣ d - 40 ∣ = 1

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

d - 40 = - 1 or d - 40 = 1

d - 40 = - 1 or d - 40 = 1

d = 39 or d = 41

u, ∣ u + v ∣ = 2

x^{2} - 6 x + 5 = 2 x - 2

2 ∣ 4 n - 16 ∣ = 0

\frac{2 x - 3}{5} = 7

∣ d ∣ - 5 = 13