Numerical Ability - Simplification & Approximation
Simplify: (5³ − 4²) × √121
Simplify: (5³ − 4²) × √121
hard Q10 of 15
Step-by-Step Solution
Step 1: Evaluate the powers
5³ = 125 and 4² = 16.Step 2: Subtract powers
125 − 16 = 109.Step 3: Multiply by the root
√121 = 11 → 109 × 11 = 1199.Final Answer:
1199 → Option D.Quick Check:
109×10=1090; +109 → 1199 ✅
Quick Trick: Perform subtraction of powers first, then multiply by the root.
Common Mistakes:
- Multiplying before subtracting or mis-evaluating the root.
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