Solve the Equation: Unraveling 7a(3 + 1/a) - 2a = 0

Solve for a:

7a(3+1a)2a=0 7a(3+\frac{1}{a})-2a=0

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Open parentheses properly, multiply by each factor
00:20 Simplify what we can
00:27 Collect like terms
00:32 Arrange the equation so that one side has only the unknown A
00:40 Isolate A
00:47 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Solve for a:

7a(3+1a)2a=0 7a(3+\frac{1}{a})-2a=0

2

Step-by-step solution

To solve the equation 7a(3+1a)2a=0 7a(3+\frac{1}{a})-2a=0 , follow these steps:

  • Step 1: Distribute and Simplify

    Begin by distributing the 7a 7a across the terms inside the parentheses:

    7a(3+1a)=7a×3+7a×1a 7a(3+\frac{1}{a}) = 7a \times 3 + 7a \times \frac{1}{a}

    This simplifies to:

    21a+7 21a + 7

    Thus, the equation becomes:

    21a+72a=0 21a + 7 - 2a = 0

  • Step 2: Combine Like Terms

    Combine the 'a' terms on the left side:

    21a2a+7=0 21a - 2a + 7 = 0

    This simplifies to:

    19a+7=0 19a + 7 = 0

  • Step 3: Solve for a a

    Rearrange the equation to solve for a a :

    19a=7 19a = -7

    Divide both sides by 19 to isolate a a :

    a=719 a = -\frac{7}{19}

Therefore, the solution to the equation is a=719 a = -\frac{7}{19} .

3

Final Answer

a=719 a=-\frac{7}{19}

Practice Quiz

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Solve for x:

\( 2(4-x)=8 \)

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