Maths Questions
1) Find the cube root of 216.
2) Find the cube root of 1728.
answer this question in prime factorization method
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Find the cube root of 216
The cube root of 216 by prime factorization is
(2 × 2 × 2 × 3 × 3 × 3)1/3
= 6.
Find the cube root of 1728.
EXPLAINATION
Step 1: Find the prime factors of 1728
1728 = 2x2x2x2x2x2x3x3x3
Step 2: Group the factors in a pair of three and write in the form of cubes.
1728 = (2x2x2)x(2x2x2)x(3x3x3)
1728 = 23x23x33
Step 3: Apply cube root both the sides and take out the terms in cubes out of the cube root.
3√1728 = 3√(23x23x33) = 2 x 2 x 3 = 12
Hence, 3√1728 =12
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216 = 2 X 2 X 2 X 3 X 3 X 3 [because these are prime factors when we factorize] as in picture 2
now in cube root we make pairs of 3 so
which is 6.
So 1) Ans- 6
2) Ans- 12
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