2-7-18+(-3+4-50)

Remove parentheses.

2-7-18-3+4-50

Rewrite -18 as -1(18).

2-7-1(18)-3+4-50

Rewrite -1(18) as -1⋅18.

2-7(-1⋅18)-3+4-50

Rewrite -1 as i.

2-7(i⋅18)-3+4-50

Rewrite 18 as 32⋅2.

Factor 9 out of 18.

2-7(i⋅9(2))-3+4-50

Rewrite 9 as 32.

2-7(i⋅32⋅2)-3+4-50

2-7(i⋅32⋅2)-3+4-50

Pull terms out from under the radical.

2-7(i⋅(32))-3+4-50

Move 3 to the left of i.

2-7(3⋅i2)-3+4-50

Multiply 3 by -7.

2-21(i2)-3+4-50

Rewrite -50 as -1(50).

2-21i2-3+4-1(50)

Rewrite -1(50) as -1⋅50.

2-21i2-3+4(-1⋅50)

Rewrite -1 as i.

2-21i2-3+4(i⋅50)

Rewrite 50 as 52⋅2.

Factor 25 out of 50.

2-21i2-3+4(i⋅25(2))

Rewrite 25 as 52.

2-21i2-3+4(i⋅52⋅2)

2-21i2-3+4(i⋅52⋅2)

Pull terms out from under the radical.

2-21i2-3+4(i⋅(52))

Move 5 to the left of i.

2-21i2-3+4(5⋅i2)

Multiply 5 by 4.

2-21i2-3+20i2

2-21i2-3+20i2

Subtract 3 from 2.

-21i2-1+20i2

Add -21i2 and 20i2.

-i2-1

Reorder -i2 and -1.

-1-i2

-1-i2

Evaluate 2-7 square root of -18+(-3+4 square root of -50)