0 reads0 ratings0 helpful
What is the value of (18^2-7^2)?
Advertisement
Answer and explanation
Correct answer: 275
Use the difference of squares identity: \(18^2-7^2=(18-7)(18+7)=11\times25=275\). Therefore, 275 is the correct answer. Getting 265 usually results from an error in subtraction. Exam tip: use \(a^2-b^2=(a-b)(a+b)\) to calculate such expressions quickly.
Frequently asked questions
What is the correct answer to this question?
275
Why is this the correct answer?
Use the difference of squares identity: \(18^2-7^2=(18-7)(18+7)=11\times25=275\). Therefore, 275 is the correct answer. Getting 265 usually results from an error in subtraction. Exam tip: use \(a^2-b^2=(a-b)(a+b)\) to calculate such expressions quickly.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Exponents.
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