Question

20-b^2=-5 помогите плизз

Answer 1

20 - b^2 = - 5 
- b^2 = - 5 -  20
- b^2 = - 25
b^2 = 25
b₁ = - 5 
b₂ = 5 

Answer 2

20-b²=-5
-b²=-25
b²=25
b=√25
b=5, -5