Solve the Linear Equation: Unravel 3x + 5(x + 4) = 0

Question

3x+5(x+4)=0 3x+5(x+4)=0

Video Solution

Solution Steps

00:00 Solve
00:03 Open parentheses properly, multiply by each factor
00:12 Group factors
00:19 Arrange the equation so that only the unknown X is on one side
00:25 Isolate X
00:34 Factor 20 into 4 and 5
00:38 Factor 8 into 4 and 2
00:41 Reduce what we can, and substitute
00:47 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Apply the distributive property to the equation.
  • Step 2: Combine like terms.
  • Step 3: Solve for x x .

Now, let's work through each step:

Step 1: Distribute the number 5 across the expression inside the parentheses:
3x+5(x+4)=0 3x + 5(x + 4) = 0 becomes 3x+5x+20=0 3x + 5x + 20 = 0 .

Step 2: Combine the like terms:
Combine 3x 3x and 5x 5x to get 8x 8x .
Thus, the equation becomes 8x+20=0 8x + 20 = 0 .

Step 3: Solve for x x :
Subtract 20 from both sides: 8x=20 8x = -20 .
Finally, divide both sides by 8: x=208 x = \frac{-20}{8} .

Simplify the fraction: x=2.5 x = -2.5 .

Therefore, the solution to the equation is x=2.5 x = -2.5 .

Answer

x=2.5 x=-2.5