Arithmatical - Square Roots and Cube Roots
DIRECTIONS : Problems based on Square Roots.
| 16. |
If 2 * 3 = √12 and 3 * 4 = 5, then the value of 5 * 12 is |
| |
A. 13 |
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B. 15 |
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C. 18 |
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D. 21 |
| Solution |
| Clearly, a * b | = √a2 + b2. |
| Therefore, 5 * 12 | = √52 + 122 |
| ‹=› √25 + 144 |
| ‹=› √169 |
| ‹=› 13. |
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