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-3(u+2)=5u-1+5(2u+1)

User TalESid
by
8.0k points

2 Answers

3 votes

Answer:


\sf u = -(5)/(9)

Explanation:

Expand the following:


\longrightarrow -3(u + 2) = 5u - 1 + 5(2u + 1)

5(2u + 1) = 10u + 5:


\longrightarrow -3(u + 2) = 5u - 1 + 10u + 5

-3(u + 2) = -3u - 6:


\longrightarrow -3u - 6= 10 u + 5 u - 1 + 5

Grouping like terms,

5u - 1 + 10u + 5 = (5u + 10u) + (-1 + 5):


\longrightarrow -3u - 6 = (5u + 10u) + (-1 + 5)

5u + 10u = 15u:


\longrightarrow -3u - 6 = 15u + (-1 + 5)

5 - 1 = 4:


\longrightarrow -3u - 6 = 15u + 4

Subtract 15 u from both sides:


\longrightarrow (-3u - 15u) - 6 = (15u - 15u) + 4

-3u - 15u = -18u:


\longrightarrow -18u - 6 = (15u - 15u) + 4

15u - 15u = 0:


\longrightarrow -18u - 6 = 4

Add 6 to both sides:


\longrightarrow (6 - 6) - 18u = 6 + 4

6 - 6 = 0:


\longrightarrow -18u = 4 + 6

4 + 6 = 10:


\longrightarrow -18u = 10

Divide both sides of -18 u = 10 by -18:


\longrightarrow
\sf (-18u)/(-18)= (10)/(-18)


\sf (-18)/(-18)=1:


\longrightarrow
\sf u = (10)/(-18)


\sf (10)/(-18)=(5)/(-9):


\longrightarrow
\sf u = (5)/(-9)

Multiply numerator and denominator of
\sf (10)/(-18) by -1:


\longrightarrow
\sf u = (-5)/(9)

User Mostsquares
by
7.8k points
0 votes

Answer:

u = -5/9

General Formulas and Concepts:

Pre-Algebra

  • Order of Operations: BPEMDAS
  • Equality Properties

Explanation:

Step 1: Define equation

-3(u + 2) = 5u - 1 + 5(2u + 1)

Step 2: Solve for u

  1. Distribute: -3u - 6 = 5u - 1 + 10u + 5
  2. Combine like terms: -3u - 6 = 15u + 4
  3. Add 3u to both sides: -6 = 18u + 4
  4. Subtract 4 on both sides: -10 = 18u
  5. Divide 18 on both sides: -10/18 = u
  6. Simplify: -5/9 = u
  7. Rewrite: u = -5/9

Step 3: Check

Plug in u into the original equation to verify it's a solution.

  1. Substitute in u: -3(-5/9 + 2) = 5(-5/9) - 1 + 5(2(-5/9) + 1)
  2. Multiply: -3(-5/9 + 2) = -25/9 - 1 + 5(-10/9 + 1)
  3. Add: -3(13/9) = -25/9 - 1 + 5(-1/9)
  4. Multiply: -13/3 = -25/9 - 1 - 5/9
  5. Subtract: -13/3 = -34/9 - 5/9
  6. Subtract: -13/3 = -13/3

Here we see that -13/3 does indeed equal -13/3.

∴ u = -5/9 is a solution of the equation.

User Cereal Killer
by
8.0k points
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