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If 5x^2 - 20 = 0, what is the value of x?
Practice Questions
Q1
If 5x^2 - 20 = 0, what is the value of x?
-2
2
4
0
Questions & Step-by-Step Solutions
If 5x^2 - 20 = 0, what is the value of x?
Correct Answer: ±2
Steps
Concepts
Step 1: Start with the equation 5x^2 - 20 = 0.
Step 2: Add 20 to both sides of the equation to get 5x^2 = 20.
Step 3: Divide both sides of the equation by 5 to isolate x^2. This gives you x^2 = 4.
Step 4: Take the square root of both sides to find x. This means x = ±2.
Quadratic Equations
– The question tests the ability to solve a basic quadratic equation by isolating the variable.
Factoring and Square Roots
– The solution involves recognizing that the equation can be simplified to find the square roots.
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