As stated, the question does not make sense: x square root of 4 is x2 or 2x, as it is more conventionally written.
There is no term for 2x in the expansion of x - 3*sqrt(7)
The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
4 x square root of 10 minus square root of 10 = 3 x square root of 10.
9 square root 4 minus 12 square root 4 = -6
The square root of 28 minus the squared root of 7 =±2.64575131
Square root 400 - square root 196 = 6
Square root (24) - square root (6) = 2.44948974
To 3 decimal places, the answer is -3.924
The square root of -4 is: 2 i
2.82842712
If that is a hyphen the answer is 80. if it is a minus sign the answer is 80i where i is the square root of minus 1
square root(minus 9) = 3 ior in correct mathematical notation it is (+,-)i_square root(9)
The answer is 0.