3 years ago

X² – 2x=4

Mathematics

1 answer:

Shtirlitz [24]3 years ago

3 0

Answer:

x= -1.24, 3.24

Step-by-step explanation:

x² – 2x=4

Bring 4 over

x² – 2x - 4=0

Quadratic formula:

if ax²+bx+c=0

$\frac{b(+-)\sqrt{b^2-4ac} }{2a}$ the (+-) = ±

$\frac{-(-2)+\sqrt{(-2)^2-4*1*(-4)} }{2*1}$ = 3.24

$\frac{-(-2)-\sqrt{(-2)^2-4*1*(-4)} }{2*1}$ = -1.24

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