Question

What is equivalent to the square root of -98

Answer 1

Answer:

7√2 i

Step-by-step explanation:

√(-98)

=√{(-1) .98}

=√(-1 . 2 . 7²)

=√-1 .√2 . √7²

= i . √2 . 7         [∵√-1 = i ]

=7√2 i

Answer 2

Answer:

$\large\boxed{\sqrt{-98}=7\sqrt2\ i}$

Step-by-step explanation:

$\sqrt{-98}=\sqrt{(-1)(49)(2)}\qquad\text{use}\ \sqrt{ab}=\sqrt{a}\cdot\sqrt{b}\\\\=\sqrt{-1}\cdot\sqrt{49}\cdot\sqrt2\qquad\text{use}\ \sqrt{-1}=i\ -\text{an imaginary unit}\\\\=i\cdot7\cdot\sqrt2\qquad\sqrt{49}=7\ \text{because}\ 7^2=49\\\\=7\sqrt2\ i$