Question

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

Answer 1

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`