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Those are both 'complex' numbers. Together, they are a pair of complex conjugates.
Complex numbers form: a + bi where a and b are real numbers. The conjugate of a + bi is a - bi If you multiply a complex number by its conjugate, the product will be a real number, such as (a + bi)(a - bi) = a2 - (bi)2 = a2 - b2i2 = a2 - b2(-1) = a2 + b2
Complex numbers are numbers of the a + bi where a and b are real number and i is the imaginary square root of -1.
A complex number is any number that can be represented in the form of a+bi, the real numbers are a and b, the imaginary number is i. Complex numbers are used in scientific and engineering fields.
If y = a + bi and z = c + di are two complex numbers then z - y = (c - a) + (d - b)i