Question

X² + 20X = 2X² + 10X?

Answer 1

Explicação passo-a-passo:

x² +20x = 2x² +10x

x² - 2x² +20x -10x =0

- 1x² + 10x = 0 (× -1)

x² - 10x =0

x(x-10)=0

x1= 0

x-10=0

x= +10

x2= 10

S={ 0, 10}