Question

X²+12x=28
Preciso da conta

Answer 1

Explicação passo-a-passo:

Bom dia!

x² + 12x -28 = 0

a = 1

b= 12

c= -28

∆ = b² -4.a.c

∆ = 12² -4.1.(-28)

∆ = 144 + 112

∆ = 256

x = -b ±√∆/2.a

x= -12±√256/2

x' = -12 + 16/2

x' = 4/2

x' = 2

x" = -12-16

x" = - 28/2

x" = -14

s = { -14,2}

abraços

Answer 2

X2 + 12x - 28 = 0

a=1

b=12

c= -28

X= $\frac{ - b + - \sqrt{ {b}^{2} - 4ac} }{2a}$

X= $\frac{ - (12) + - \sqrt{ {12}^{2} - 4(1)(-28)} }{2(1)}$

X= $\frac{ - 12 + - \sqrt{144 + 112 } }{2}$

X=$\frac{ - 12 + - \sqrt{256} }{2}$

X=$\frac{ - 12 + - 16}{2}$

X'=$\frac{ - 12 + 16}{2}$

X'=$\frac{4}{2}$

X'= 2

X"= $\frac{ - 12 - 16}{2}$

X"=$\frac{ - 28}{2}$

X"= -14

S=(2;-14)