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nexus9112 [7]
3 years ago
8

Solve each equation using the Quadra1. 4x2 +1 1x - 20=0​

Mathematics
2 answers:
Maslowich3 years ago
6 0

Answer:

{-4, 5/4}

Step-by-step explanation:

Note:  most Brainly 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}

​  

​

Tatiana [17]3 years ago
4 0

Answer:

x= 12/11

Step-by-step explanation:

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7 0
2 years ago
Read 2 more answers
Pleaseeeee helpp me question 2 .
OLga [1]

Answer:  If you are supposed to graph a line, it will be a horizontal line (parallel to the x-axis) passing through +3 on the y-axis. The slope is 0.

it is a function.

If you are doing range and domain, the range is [3] and the domain is [1,2,3,4,5]

Step-by-step explanation: If there are directions above question 1 that apply to question 2, please add them to the comments.

Maybe someone else will be able to help if it is too late for me to edit this answer.

8 0
3 years ago
HELP PLZ I GIVE YOU BRAINLIEST IF YOU GET CORRECT PLZ I BEG YOU
DiKsa [7]

Answer:

Original number = 38

Step-by-step explanation:

10*x + y

x   = y - 5

10y + x = 2 (10x + y) +  7

10y + y - 5 = 2(10(y - 5) + y) + 7

11y - 5 = 2(10y - 50 + y ) + 7

11y - 5 = 2(11y - 50) + 7

11y - 5 = 22y - 100 + 7

11y - 5 = 22y - 93

11y + 88 = 22y

88 = 11y

y = 8

x = y - 5

x = 8 - 5

x = 3

So the original number is 38. Does that work?

3 is 5 less than 8.

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8 0
3 years ago
-a^2+46a-480=0<br> a - ?
sattari [20]
a = 30
a = 16

-a² + 46a -480 = 0

(-a + 30) (a -16) = 0
(-a)(a) + (-a)(-16) + 30(a) + 30(-16) = 0
-a² + 16a + 30a -480 = 0
-a² + 46a - 480 = 0

(-a + 30) = 0   ; (a - 16) = 0
-a = -30          ;   a = 16
 a = 30

To check:
a = 30
-(30)² + 46(30) - 480 = 0
-900 + 1380 - 480 = 0
480 - 480 = 0
0 = 0

a = 16
-(16)² + 46(16) - 480 = 0
-256 + 736 - 480 = 0
480 - 480 = 0
0 = 0
5 0
3 years ago
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