Question

Calcule as raízes de cada equação:
a) -x^2 + 4 = 0
b) -2x^2 + 8x = 0
c) 6x^2 - 216 = 0

Answer 1

Resposta:

a) -x²=-4

x²=4

x=√4 x= 2

b)-2x²+8x= 0

∆=8²-4.(-2).0

∆=64+0 ∆=0

-8+-√64/2.(-2)

x¹=-8+8÷-4 x¹=0÷-4 x¹= 0

x²=-8-8÷-4 x²=-16÷-4 x²= 4

c) 6x²= 216

x²= 216÷6

x²=36

x= √36

x=6