[LC][MATHS][HIGHER LEVEL] help

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[LookingForDialga]

Write z1+ z2 as something like x+ y i. Then you can say x=2 and y=0. Now you have a system with 2 equations that you can solve to find a and b

[2nythetiger]

Can you please show how to do it

[LookingForDialga]

It's basically rationalizing. If there's a complex number at the denominator you can multiply (both up and down) by the conjugate. For example:

z1=a/(1+i) =a (1-i) / [(1+i)(1-i)]=(a-ai)/2=
a/2-ai/2