Use the quadratic formula to solve Round irrational solutions to the nearest tenth

Question

asked Mar 11, 2020 29.2k views

1 Answer

Santeau · Answer 1 · 2020-03-15T07:42:20+0000

Answer:

C. x = -5.6 and x = -1.4

Explanation:

The quadratic formula is
x=(-b+/-√(b^2-4ac) )/(2a) . Here a=1, b=7, and c=8.

Substitute and you'll have:

x=(-b+/-√(b^2-4ac) )/(2a) =(-7+/-√(7^2-4(1)(8)) )/(2(1))=(-7+/-√(49-32) )/(2))

(-7+/-√(17) )/(2)=(-7+/-4.1 )/(2)= -1.4, -5.6