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Shortcut used: Use divisibility, cancellation, and BODMAS before long calculation.
Solve in 3 steps:
- Check operation order.
- Cancel common factors.
- Use divisibility/remainder rules where applicable.
Common mistake: Do not break left-to-right order for equal-priority operations.
Question 8
Multiple Choice Question
Question
Find the value of 15² - 12².
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Simplification
The value is 81.
Why this answer is correct
The answer follows the correct operation order or number rule.
Short Explanation
The value is 81.
Detailed Explanation
Question
Find the value of 15² - 12².
ANSWER
Correct Answer: C
Method / Topic: Simplification
Using a²-b²=(a-b)(a+b): 15²-12²=(15-12)(15+12)=3×27=81.
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Question 8
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Learn + solve
Shortcut used, common trap, and the fastest solving route
Shortcut used: Use divisibility, cancellation, and BODMAS before long calculation.
Solve in 3 steps:
- Check operation order.
- Cancel common factors.
- Use divisibility/remainder rules where applicable.
Common mistake: Do not break left-to-right order for equal-priority operations.
Question
Find the value of 15² - 12².
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Simplification
The value is 81.
Why this answer is correct
The answer follows the correct operation order or number rule.
Short Explanation
The value is 81.
Detailed Explanation
Question
Find the value of 15² - 12².
ANSWER
Correct Answer: C
Method / Topic: Simplification
Using a²-b²=(a-b)(a+b): 15²-12²=(15-12)(15+12)=3×27=81.
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