Solve the Equation: Unravel the Quadratic (x+3)^2 + (2x-3)^2 = 5x(x-3/5)

Question

Find a X given the following equation:

(x+3)2+(2x3)2=5x(x35) (x+3)^2+(2x-3)^2=5x(x-\frac{3}{5})

Video Solution

Solution Steps

00:00 Find X
00:10 Use the shortened multiplication formulas to open the parentheses
00:26 Carefully open parentheses properly, multiply by each factor
00:51 Solve the multiplications and squares
01:06 Group like terms
01:36 Isolate X
02:08 And this is the solution to the question

Step-by-Step Solution

To solve this problem, let's expand and simplify each side of the given equation:

  • Step 1: Expand the left side:
    • Expand (x+3)2=x2+6x+9(x + 3)^2 = x^2 + 6x + 9
    • Expand (2x3)2=4x212x+9(2x - 3)^2 = 4x^2 - 12x + 9
    Combine them to get x2+6x+9+4x212x+9=5x26x+18x^2 + 6x + 9 + 4x^2 - 12x + 9 = 5x^2 - 6x + 18.
  • Step 2: Expand the right side:
    • Expand 5x(x35)=5x23x5x(x - \frac{3}{5}) = 5x^2 - 3x
  • Step 3: Set the equations from both sides equal and simplify: 5x26x+18=5x23x 5x^2 - 6x + 18 = 5x^2 - 3x
  • Step 4: Subtract 5x25x^2 from both sides: 6x+18=3x-6x + 18 = -3x
  • Step 5: Simplify to: 6x+3x=18 -6x + 3x = -18 or equivalently 3x=18-3x = -18
  • Step 6: Solve for xx: x=183=6 x = \frac{-18}{-3} = 6

Therefore, the solution to the problem is x=6 x = 6 .

Answer

6 6