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3 years ago

Solve x^2 – 3x = –8 using the quadratic formula.

Mathematics

1 answer:

Zina [86]3 years ago

3 0

Answer:

on your scientific calculator click on MODE then number 5 then number 3 and put those numbers x^2 – 3x = –8

(AFTER WRITING EACH NUMBER CLICK ON = SO YOU CAN PUT THE OTHER NUMBERS. FOR EXAMPLE, WRITE 1 AS A THEN CLICK = AND SO ON)

1 and A (write 1 first then click =)

-3 as B (write -3 then click =)

+8 as C (write 8 then click =)

then you will get the answer of x1 and 2

Step-by-step explanation:

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Unit 3 parallel and perpendicular lines Homework 3 proving lines are parallel

IrinaK [193]

Step-by-step explanation:

Since, lines l and m are parallel and a transverse is intersecting these lines.

5). (9x + 2)° = 119° [Alternate intrior angles]

9x = 117 ⇒ x = 13

6). (12x - 8)° + 104° = 180°

12x = 180 - 96

x = ⇒ x = 7

7). (5x + 7) = (8x - 71) [Alternate exterior angles]

8x - 5x = 71 + 7

3x = 78

x = 26

8). (4x - 7) = (7x - 61) [Corresponding angles]

7x - 4x = -7 + 61

3x = 54

x = 18

9). (9x + 25) = (13x - 19) [Corresponding angles]

13x - 9x = 25 + 19

4x = 44

(13x - 19)° + (17y + 5)° = 180°[Linear pair of angles are supplementary]

(13×11) - 19 + 17y + 5 = 180

129 + 17y = 180

17y = 180 - 129

y = 3

10). (3x - 29) + (8y + 17) = 180 [linear pair of angles are supplementary]

3x + 8y = 180 + 12

3x + 8y = 192 -----(1)

(8y + 17) = (6x - 7) [Alternate exterior angles]

6x - 8y = 24

3x - 4y = 12 -----(2)

Equation (1) - equation (2)

(3x + 8y) - (3x - 4y) = 192 - 12

12y = 180

y = 15

From equation (1),

3x + 8(15) = 192

3x + 120 = 192

x = 24

11). (3x + 49)° = (7x - 23)° [Corresponding angles]

7x - 3x = 49 + 23

4x = 72 ⇒ x = 18

(11y - 1)° = (3x)° [Corresponding angles]

11y = 3×18 + 1

11y = 55 ⇒ y = 5

12). (5x - 38)° = (3x - 4)° [Corresponding angles]

5x - 3x = 38 - 4

2x = 34

x = 17

(7y - 20)° + (5x - 38)° + 90° = 180°

[Sum of interior angles of a triangle = 180°]

5x + 7y = 148

5×17 + 7y = 148

85 + 7y = 148

7y = 148 - 85

y =

5 0

3 years ago

What is the slope??????

Andrews [41]

1/3 you can use two formulas but I recommend rise over run

5 0

3 years ago

What are 2 points on the graph for 6x-5y=25

zepelin [54]

To find any two random point on the graph of 6x-5y=25, we can just plug in any two values for x and solve for y, and find the 2 points in the form of (x,y).

So lets plug in x=0.

$\sf 6x-5y=25$
$\sf 6(0)-5y=25$
$\sf -5y=25$
$\sf y=-5$
So one point is (0,-5)

And to find another point, we can plug in x=1

$\sf 6x-5y=25$
$\sf 6(1)-5y=25$
$\sf 6-5y=25$
$\sf -5y=25-6$
$\sf -5y=19$
$\sf y=19/-5$
$\sf y=-3.8$
So another point is (1,-3.8)

8 0

3 years ago

Bvtcctctctc CJ bububuv

Brut [27]

Answer:

A) $y+7=-3(x-4)$

Step-by-step explanation:

Hi there!

The given equations are written in point-slope form: $y-y_1=m(x-x_1)$ where <em>m</em> is the slope of the line and $(x_1,y_1)$ is a point that falls on the line

Notice how the line is travelling infinitely down as x increases. This means that the slope is negative.

Therefore, the equation of the line is either A or B.

Now, let's look at A:

$y+7=-3(x-4)$

This equation suggests that the point (4,-7) falls on the line, which it does.

Therefore, the equation of the graph is $y+7=-3(x-4)$ .

I hope this helps!

5 0

3 years ago

Mabel and her friends went to a movie on Thursday afternoon. They left at 12:10 P.M. It took 30 minutes to drive to the theater.

GrogVix [38]

Answer:

4:15

Step-by-step explanation:

12:10+30=12:40

12:40+65=1:45

1:45+ 150= 4:15

5 0

3 years ago

Read 2 more answers