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How did you learn to simplify radicals (like simplifying sq.rt.48 to 4 sq.rt.3 or cube root 48 to 2 cube root 6)

I think I discovered a new way to simplify radicals that is simple, easy, works every time, and with slight modification, can work for roots of any power (cube roots, 10th power roots, etc.). I want to see if anyone else has learned how I do it though.

2007-12-28 04:50:11 · 3 answers · asked by hillhavengirl 2 in Science & Mathematics Mathematics

3 answers

√ 48 = √ (16 x 3) = 4√ 3
48^(1/3) = (8 x 6)^(1/3) = 2 [ 6^(⅓) ]

2007-12-28 10:00:42 · answer #1 · answered by Como 7 · 3 0

Factor 48 into primes as
48 = 2 x 2 x 2 x 2 x 3
If sq.rt. is desired, separate pairs of primes as
(2 x 2) and ( 2 x 2). Thus, there are two pairs of 2 which give 2 x 2 = 4 outside the sq.rt. sign and 3 within the sq.rt. sign giving 4 sq.rt. 3
If cu.rt. of 48 is desired, write 48 = (2 x 2 x 2) x 2 x 3
Only one pair of 3 2's is there. So, 2 comes out of cu.rt. and 2 x 3 = 6 remains inside
Thus, cu.rt. of 48 = 2 cu.rt. 6

2007-12-28 05:38:49 · answer #2 · answered by Madhukar 7 · 0 0

Factoring is the usual method when not using a calculator.

√48 = √16*3 = √4*4*3 = 4√3

(48)^1/3 = (3*2^3)^1/3 = 2(3)^1/3

2007-12-28 05:14:54 · answer #3 · answered by Hate the liars and the Lies 7 · 0 0

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