4-49+3-4

Rewrite -49 as -1(49).

4-1(49)+3-4

Rewrite -1(49) as -1⋅49.

4(-1⋅49)+3-4

Rewrite -1 as i.

4(i⋅49)+3-4

Rewrite 49 as 72.

4(i⋅72)+3-4

Pull terms out from under the radical, assuming positive real numbers.

4(i⋅7)+3-4

Move 7 to the left of i.

4(7⋅i)+3-4

Multiply 7 by 4.

28i+3-4

Rewrite -4 as -1(4).

28i+3-1(4)

Rewrite -1(4) as -1⋅4.

28i+3(-1⋅4)

Rewrite -1 as i.

28i+3(i⋅4)

Rewrite 4 as 22.

28i+3(i⋅22)

Pull terms out from under the radical, assuming positive real numbers.

28i+3(i⋅2)

Move 2 to the left of i.

28i+3(2⋅i)

Multiply 2 by 3.

28i+6i

28i+6i

Add 28i and 6i.

34i

Simplify 4 square root of -49+3 square root of -4