CBSE Class 8 Answered
Find the cube roots of 64 and 216 by cube pattern:
13 = 1
23-13 = 7
33-23 = 19
43-33 = 37
53-43 = 61
63-53 = 91 ......
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
For 64,
Subtract 1,7,19,37.. in a sequence
(1) 64-1=63
(2) 63-7=56
(3) 56-19=37
(4) 37-37=0 -- 4 steps
Therefore the cube root of 64 is '4'.
For 216,
Subtract 1,7,19,37.. in a sequence
(1) 216-1=215
(2) 215-7=208
(3) 208-19=189
(4) 189-37=152
(5) 152-61=91
(6) 91-91=0 -- 6 steps
Therefore the cube root of 216 is '6'.
Answered by | 04 Jun, 2014, 03:23: PM
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