Question

4
a Calculați suma elementelor mulțimii A = {x € R|(x - 1)²= 4}.​

Answer 1

(x - 1)²= 4

x-1= +/- 2

x-1= 2

=> x=3

x-1= -2

=> x= -1

S= {-1; 3}

Baftă!

Answer 2

A = {x ∈ℝ|(x - 1)²= 4}

(x-1)²=4

x-1=±√4

x-1=±2

=> x-1=2

x=3

x-1=-2

x=-1

S=3+(-1)=3-1=2

Kawaiimath