Solve each equation using the quadra
1. 4x2 +1 1x - 20=0

{-4, 5/4}

Step-by-step explanation:

Note:  most users don't have access to Quadra 1, so you may as well omit that when you post a question.  

By "4x2 +1 1x - 20=0" I assume you meant   4x^2 +11x - 20=0  (11, not 1 1, and use " ^ " to denote exponentiation, please).

Here I will use the quadratic formula.  Here, a = 4, b = 11 and c = -20, so the discriminant is

b²-4ac = 121 - 4(4)(-20), or 121 + 320, or 441.

Since this is positive, the quadratic has two unequal, real roots.

                              - 11 ± √441

The roots are x =

                                    2(4)

          -11 ± 21

or x =  →  x = 10/8 or x = 5/4;  also x = -32/8 or x = -4.

                8

The roots are {-4, 5/4}

step-by-step explanation:

12475909

the answer is d

hope this