Solve the Quadratic Equation: x²/4 + x - 1¼ = 0

Question

Solve the following equation:

x24+x114=0 \frac{x^2}{4}+x-1\frac{1}{4}=0

Video Solution

Solution Steps

00:00 Find X
00:04 Multiply to eliminate fractions
00:16 Identify the coefficients
00:31 Use the roots formula
00:48 Substitute appropriate values according to the given data and solve
01:18 Calculate the square and products
01:33 Calculate the square root of 36
01:45 These are the 2 possible solutions (addition,subtraction)
01:59 And this is the solution to the question

Step-by-Step Solution

To solve this quadratic equation, we'll follow these steps:

  • Step 1: Eliminate fractions and rearrange the equation.
  • Step 2: Use the Quadratic Formula to find the solutions.
  • Step 3: Simplify the solutions for x x .

Now, let's work through each step:

Step 1: The given equation is x24+x114=0 \frac{x^2}{4} + x - 1\frac{1}{4} = 0 .

First, multiply every term by 4 to eliminate the fraction: x2+4x5=0 x^2 + 4x - 5 = 0

Step 2: The equation is now in the standard form ax2+bx+c=0 ax^2 + bx + c = 0 with a=1 a = 1 , b=4 b = 4 , and c=5 c = -5 .

Step 3: Apply the Quadratic Formula: x=b±b24ac2a x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Substitute the values of a a , b b , and c c : x=4±424×1×(5)2×1 x = \frac{-4 \pm \sqrt{4^2 - 4 \times 1 \times (-5)}}{2 \times 1} x=4±16+202 x = \frac{-4 \pm \sqrt{16 + 20}}{2} x=4±362 x = \frac{-4 \pm \sqrt{36}}{2}

Simplify the square root and solve for x x : x=4±62 x = \frac{-4 \pm 6}{2}

Calculating the two possible solutions: x1=4+62=22=1 x_1 = \frac{-4 + 6}{2} = \frac{2}{2} = 1 x2=462=102=5 x_2 = \frac{-4 - 6}{2} = \frac{-10}{2} = -5

Therefore, the solutions to the quadratic equation are x1=1 x_1 = 1 and x2=5 x_2 = -5 .

The correct choice corresponds to the answer: x1=1,x2=5 x_1 = 1, x_2 = -5 .

Answer

x1=1,x2=5 x_1=1,x_2=-5