The value of - 1 - -1 is -

The correct option is A 1 We define √( a) #160;as the quantity #160;which is being multiplied by it self (or) squared become equal to ' a'.S ...

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Standard VIII

Mathematics

Finding the Square of a Number

The value of ...

Question

The value of $\sqrt{(- 1)} . \sqrt{(- 1)}$ is :

- 1

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+ 1

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\pm 1

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None of these

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Solution

The correct option is A $- 1$
We define $\sqrt{- a}$ as the quantity which is being multiplied by it self (or) squared become equal to '- a'.
So $\sqrt{- a} \times \sqrt{- a} = (\sqrt{- a})^{2} = - a$
$∴ \sqrt{- 1} \times \sqrt{- 1} = - 1$

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The value of √(−1).√(−1) is :

The correct option is A −1We define √−a as the quantity which is being multiplied by it self (or) squared become equal to '- a'.So √−a×√−a=(√−a)2=−a∴√−1×√−1=−1

The value of $\sqrt{(- 1)} . \sqrt{(- 1)}$ is :

The correct option is A $- 1$
We define $\sqrt{- a}$ as the quantity which is being multiplied by it self (or) squared become equal to '- a'.
So $\sqrt{- a} \times \sqrt{- a} = (\sqrt{- a})^{2} = - a$
$∴ \sqrt{- 1} \times \sqrt{- 1} = - 1$