Question

If z+z×z=12 find z.
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Answer 1

4 is the correct answer

Answer 2

Answer:

- 4 or +3

Step-by-step explanation:

z + z x z = z + z²

z + z² = 12

z² + z - 12 = 0

z²  + 4z - 3z - 12 = 0

z (z + 4) - 3 (z + 4) = 0

=> (z + 4 )(z - 3 ) = 0

z + 4 = 0.. so z = -  4

z - 3 = 0.. so z = 3

so z = - 4 or +3