Solve 4sqrt{-49}+7sqrt{-81}

$$4 \sqrt{ -49 } +7 \sqrt{ -81 }$$

Evaluate (complex solution)

$$91i$$

Solution Steps

Calculate the square root of -49 and get 7i.

$$4\times \left(7i\right)+7\sqrt{-81}$$

Multiply 4 and 7i to get 28i.

$$28i+7\sqrt{-81}$$

Calculate the square root of -81 and get 9i.

$$28i+7\times \left(9i\right)$$

Multiply 7 and 9i to get 63i.

$$28i+63i$$

Add 28i and 63i to get 91i.

$$91i$$

Real Part (complex solution)

$$0$$

Solution Steps

Calculate the square root of -49 and get 7i.

$$Re(4\times \left(7i\right)+7\sqrt{-81})$$

Multiply 4 and 7i to get 28i.

$$Re(28i+7\sqrt{-81})$$

Calculate the square root of -81 and get 9i.

$$Re(28i+7\times \left(9i\right))$$

Multiply 7 and 9i to get 63i.

$$Re(28i+63i)$$

Add 28i and 63i to get 91i.

$$Re(91i)$$

The real part of 91i is 0.

$$0$$

Evaluate

$$\text{Indeterminate}$$