Question

x^2-4x-8=0 in 3 significant figures​

Answer 1

Answer:

5.46 and -1.46

Step-by-step explanation:

$x^2-4x-8=0$

Add 8 to both sides of the equation:

$x^2-4x=8$

Use $(\frac{b}{2} )^{2}$:

$(\frac{-4}{2}) ^{2}=4$

Add the above result (4) to both sides of the equation:

$x^2-4x+4=12$

Factor:

$(x-2)^2=12$

Solve for x:

x= ± 2$\sqrt{3}$ +2

=5.46 and -1.46