Question

alguem sabe a equaçao de x² -4x =5 me ajudem quem saber e que estiver oline

Answer 1

x² -4x = 5
x² -4x -5
Δ= b²-4ac
Δ= (-4)² -4.1.(-5)
Δ= 16 + 20
Δ= 36

x= -b +/- √Δ / 2a
x= -(-4) +/- √36 / 2.1
x'= 4 +6/ 2
x'= 10/2
x'= 5

x''= 4 -6 /2
x''= -2/2
x''= -1

Bons estudos!

Answer 2

x^2 -4x = 5
x^2 -4x -5 = 0 a = 1 b = -4 c = -5
Delta = 16 -4*1*-5 D = 16 -4*-5 D = 26 + 20 D = 36

x' = -(-4) +6/2 x' = 10/2 x' = 5

x'' = 4-6/2 x'' = -2/2 x'' = -1

S = { 5, -1}

Prova:
x' = 5 = 25 -20 -5 = 0
x'' = 1 (1+4) -5 = 0