^{n}=b

a=b

^{1/n}

But,

-1

^{2}= 1

-1 = 1

^{1/2}

-1 = 1

Please help.

Can I use this formula to solve questions on exponents

2 posts
• Page **1** of **1**

a^{n}=b

a=b^{1/n}

But,

-1^{2} = 1

-1 = 1^{1/2}

-1 = 1

Please help.

Can I use this formula to solve questions on exponents

a=b

But,

-1

-1 = 1

-1 = 1

Please help.

Can I use this formula to solve questions on exponents

- partap95
**Posts:**5**Joined:**Mon Oct 07, 2013 10:57 am

partap95 wrote:a^{n}=b

a=b^{1/n}

If you look close, the book probably says something about a&b being positive or at least non-neg.

partap95 wrote:But,

-1^{2}= 1

-1 = 1^{1/2}

-1 = 1

As soon as you start putting negs inside square roots the rules change. Because otherwise you'd get wrong answers like you showed here. The technical rule for square roots of squares is absolute value, so your second line should really be sqrt[(-1)^2] = sqrt[1] which means your last line should be |-1| = sqrt[1] so 1 = 1.

- FWT
**Posts:**108**Joined:**Sat Feb 28, 2009 8:53 pm

2 posts
• Page **1** of **1**