Question

qual é a respsta de x2 -16=0

Answer 1

x²-16=0
x²=16
x=+-√16
x=+-4

Answer 2

x²-16=0
Δ = b² -4ac
Δ = 0² -4 *1 * (-16)
Δ = 0 + 64
Δ = 64
x' = (-b + √∆)/ 2a
(-0 + 8)/2 * 1
(0 + 8)/2
8/2= 4

x'' = (-b - √∆)/ 2a
(-0 - 8)/2 * 1
(0 - 8)/2
-8/2= -4

S { 4,-4}