Question

Vivian is solving the equation 0=x2−5x−4 0 = x 2 − 5 x − 4 using the quadratic formula. Which value is the negative real number solution to her quadratic equation? Round to the nearest tenth if necessary. -5.7 -4 -1 -0.7

Answer 1

-0.7

steps:

the quadratic formula is

`\frac{ - b + - \sqrt{ {b}^(2) - 4ac } }{2a}`

substitute the correct values in

`\frac{ - ( - 5) + - \sqrt{ {( - 5)}^(2) - 4(1)( - 4) } }{2(1)}`

where it says +- you would type this into your calculator with + AND THEN - to get two separate answers.

when you type + you get the answer of: 5.701562119...

when you type - you get the answer of:

-0.7015621187...

when you round to the nearest tenth you get -0.7

hope this helps! :)

have a great day ~ •lipika•