christiantbarr christiantbarr
  • 25-10-2019
  • Mathematics
contestada

Solve the quadratic equation below.
x2 + 6x – 15 = -8

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IuliusCaesar
IuliusCaesar IuliusCaesar
  • 25-10-2019

x²+6x-15=-8

x²+6x-7=0

Δ= b²-4ac = 36+28=64

x₁,₂= [tex]\frac{-6(+/-)\sqrt{64} }{2}[/tex]

x1= [tex]\frac{-6+\sqrt{64} }{2}[/tex]=[tex]\frac{-6+8 }{2}[/tex]=

[tex]\frac{2}{2}[/tex]=1

x2= [tex]\frac{-6-sqrt{64} }{2}[/tex]=[tex]\frac{-6-8 }{2}[/tex]=

[tex]\frac{-14}{2}[/tex]=7

Answer Link
Аноним Аноним
  • 25-10-2019

Answer:

x²+6x-15=-8

Step-by-step explanation:

x = (1)

x²= 1

6x = 6

6 + 1 = 7

7 - 15 = -8

(Hope this helps)

Answer Link

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