Question

решите уравнение (4-x)(x+5)+x^2=0

Answer 1

x^2 + 4x + 20 - x^2 - 5x = 0
20 - x =0
-x = -20
x = 20

Answer 2

 (4-x)(x+5)+x^2=0
4x-x²+20-5x+x²=0
20-x=0
x=20