28.
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If 2 * 3 = √12 and 3 * 4 = 5, then the value of 5 * 12 is
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A. 13
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B. 15
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C. 18
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D. 21
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Answer:
Clearly, a * b
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= √a2 + b2.
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Therefore, 5 * 12
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= √52 + 122
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‹=› √25 + 144
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‹=› √169
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‹=› 13.
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Title : Square Roots And Cube Roots Q28
Description : 28. If 2 * 3 = √ 12 and 3 * 4 = 5, then the value of 5 * 12 is A. 13 B. 15 C. 18 D. 21 Answer: Clearly, a *...
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