Question

Quais sao as raizes da equaçao x2=3x-28=0

Answer 1

x^2 -3x -28 = 0 ∴ Δ= 9 + 112 ∴ Δ= 121

x' = 3 + √121/2= 3 + 11/2 = 14/2 = 7

x" = 3 - √121 /2 = 3-11/2 = -8/2= -4

S={-4,7}