Question

Solve using the square root method. Round the solution to the nearest tenth. x^2 - 20 = 0
A. {-10.0, 10.0}
B. {-5.5, 5.5}
C. {-3.5, 3.5}
D. {-4.5, 4.5}

Answer 1

x^2=20

\[\Large x=\pm \sqrt{20}\]

Answer 2

So . D.

Answer 3

x= 4.472...

Answer 4

x^2 - 20 = 0
x^2 = 20
x^2 = (2*2*5)
Taking square roots of both sides
x = ± 2√5 = ± 4.47 approx = ± 4.5 approx --> Option D