0 reads0 ratings0 helpful
What are the roots of the equation 5x² + 15x = 0?
Advertisement
Answer and explanation
Correct answer: x = 0, -3
Factoring gives 5x² + 15x = 5x(x + 3) = 0. By the zero-product property, x = 0 or x + 3 = 0, so x = -3. Therefore, the roots are 0 and -3. Option B results from changing the sign of -3 incorrectly. In an exam, remember to include both roots.
Frequently asked questions
What is the correct answer to this question?
x = 0, -3
Why is this the correct answer?
Factoring gives 5x² + 15x = 5x(x + 3) = 0. By the zero-product property, x = 0 or x + 3 = 0, so x = -3. Therefore, the roots are 0 and -3. Option B results from changing the sign of -3 incorrectly. In an exam, remember to include both roots.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Quadratic Equations. Topic: Methods of Solving Quadratic Equations.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement