Solve the Quadratic Equations: x² + 9 = 0 and 2x² + 8 = 0 Compared

Question

Solve each equation separately and find which x is the largest.

  1. x2+9=0 x^2+9=0

  2. 2x2+8=0 2x^2+8=0

Video Solution

Solution Steps

00:00 Find the largest X
00:03 First, let's find X from section 1
00:07 Let's isolate X
00:11 Any number squared is always greater than or equal to 0
00:15 Minus 9 is less than 0, therefore there's no solution for section 1
00:24 Now let's calculate X from section 2
00:28 Let's isolate X
00:36 Any number squared is always greater than or equal to 0
00:42 Minus 4 is less than 0, therefore there's no solution for section 2
00:48 And this is the solution to the question

Step-by-Step Solution

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

  • Step 1: Solve the equation x2+9=0 x^2 + 9 = 0
  • Step 2: Solve the equation 2x2+8=0 2x^2 + 8 = 0
  • Step 3: Compare the solutions (if any) to identify the largest x x

Step 1: Solving x2+9=0 x^2 + 9 = 0 :
First, isolate x2 x^2 by subtracting 9 9 from both sides:
x2=9 x^2 = -9 .
Since x2=9 x^2 = -9 , trying to find the square root leads to x=±9 x = \pm \sqrt{-9} ,
which involves the imaginary unit i i , hence no real solution exists.

Step 2: Solving 2x2+8=0 2x^2 + 8 = 0 :
First, isolate 2x2 2x^2 by subtracting 8 8 from both sides:
2x2=8 2x^2 = -8 .
Divide each side by 2 2 :
x2=4 x^2 = -4 .
Attempting to take the square root results in x=±4 x = \pm \sqrt{-4} ,
which similarly involves the imaginary unit i i , so no real solution exists.

Step 3: Compare the solutions:
Since both equations yield no real solutions, there is no value of x x to compare.

Therefore, there is no solution to the two equations.

Answer

There is no solution to the two equations