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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Complex#*

cmp * numeric → complex

Performs multiplication.

Example
Complex(2, 3)  * Complex(2, 3)   #=> (-5+12i)
Complex(900)   * Complex(1)      #=> (900+0i)
Complex(-2, 9) * Complex(-9, 2)  #=> (0-85i)
Complex(9, 8)  * 4               #=> (36+32i)
Complex(20, 9) * 9.8             #=> (196.0+88.2i)
See also .rectangular #** .rect #+ also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1