Question

determine a raiz a)2m²-8=0
b) 2x²-7=0
c) 2x²-7=0

Answer 1

a) Δ=0² - 4.2.(-8)
    Δ= 64
    x= (-0 +/- √64 ) / 2.2
    x= (+/- 8 ) / 4
    X1= 2
    X2= -2