What is the answer to 800=|4r+800| ?

The answer to 800=|4r+800| is r=-400\lor r=0

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800=|4r+800|

800 = ∣ 4 r + 800 ∣

r = - 400 or r = 0

Solution steps

800 = ∣ 4 r + 800 ∣

Switch sides

∣ 4 r + 800 ∣ = 800

Apply absolute rule: If

∣ u ∣ = a, a > 0

then

u = a

u = - a

4 r + 800 = - 800 or 4 r + 800 = 800

4 r + 800 = - 800 or 4 r + 800 = 800

r = - 400 or r = 0

1 = ∣ - k ∣ - 1

- 6 + 6 ∣ 5 x + 2 ∣ = 30

∣ 7 x + 7 ∣ = 56

∣ 15 x - 64 ∣ = - 4

- 1 = 6 ∣ k ∣ - 4

What is the answer to 800=|4r+800| ?
The answer to 800=|4r+800| is r=-400\lor r=0
Solve for r: 800=|4r+800|
The solution is r=-400\lor r=0