1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
koban [17]
3 years ago
10

Help please Factorise x²-x-56 its due in 4 minutes

Mathematics
2 answers:
Iteru [2.4K]3 years ago
7 0

Answer:

(x-8)(x+7)

Step-by-step explanation:

using quadratic formula we have

x=  \frac{-b+-\sqrt{b^{2}-4*a*c}}{2*a}

we have:

x^2-x-56=0

a= 1 b=-1 c=-56

so we have:

x=(-(-1)+-sqrt(1^1-4*(1)*(-56)))/(2*1)

x=1+-sqrt(1-4*(-56))/(2)

x=(1+-sqrt(225))/2

x=(1+-15)/2

so we have the roots:

x1=(1+15)/2 =8

x2=(1-15)/2=-7

so the answer is (x-8)(x+7)

Art [367]3 years ago
4 0

x^2-x-56

Think of two numbers that will equal to -x and -56.

Use the 7 and 8 times table.

(x-8)(x+7)

Because - negative number * + positive number= - negative number

(x-8)(x+7)= 0

x-8= 0

Move -8 to the other side. Sign changes from -8 to +8.

x-8+8= 0+8

x= 8

x+7= 0

Move +7 to the other side. Sign changes from +7 to -7.

x+7-7= 0-7

x= -7

Answers:

x= 8 , x= -7

You might be interested in
Select the measures of the angles of a triangle whose angles have measures in the ratio 6:8:10
morpeh [17]

Answer:

45, 60, 75

Step-by-step explanation:

The ratio of the angles are 6:8:10

Multiply by x to get the angle measures

6x, 8x,10x

We know the sum of the angles is 180 for a triangle

6x+8x+10x = 180

Combine like terms

24x = 180

Divide each side by 24

24x/24 = 180/24

x =7.5

Each angle is

6x = 6(7.5) =45

8x = 8(7.5) =60

10x = 10*7.5 = 75

4 0
3 years ago
Ethan is saving money in his piggy bank for his upcoming trip to Disney World. On the first day, he put in $12 and plans to add
PSYCHO15rus [73]

Answer:

A

12+7x=a

x=days

a=amount of money

B 12+7x=a

Step-by-step explanation:

7(18)=126

12+126=a

138=a

7 0
3 years ago
Read 2 more answers
The age of a boy is twice that of his sister. five years ago the boy was 3 times the age of his sister. How old is the boy
joja [24]

<em>Answer</em><em>:</em>

<h2><em>2</em><em>0</em><em> </em><em>years</em><em> </em><em>old</em><em>.</em></h2>

<em>Sol</em><em>ution</em><em>,</em>

<em>Let</em><em> </em><em>the</em><em> </em><em>age</em><em> </em><em>of</em><em> </em><em>sister</em><em> </em><em>be</em><em> </em><em>X</em>

<em>Let</em><em> </em><em>the</em><em> </em><em>age</em><em> </em><em>of</em><em> </em><em>boy</em><em> </em><em>be </em><em>2</em><em>x</em>

<em>Now</em><em>,</em>

<em>Five</em><em> </em><em>years</em><em> </em><em>ago</em><em>,</em>

<em>3(x - 5) = 2x - 5 \\ or \: 3x - 15 = 2x - 5 \\ or \: 3x - 2x =  - 5 + 15 \\ x = 10</em>

<em>Again</em><em>,</em>

<em>Repla</em><em>cing</em><em> </em><em>value</em><em>,</em>

<em>age \: of \: boy = 2x \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 2 \times 10 \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 20</em>

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em><em>.</em><em>.</em>

<em>Good</em><em> </em><em>luck</em><em> on</em><em> your</em><em> assignment</em><em>.</em><em>.</em>

7 0
3 years ago
Complete the square<br> x<br> 2<br> +<br> 8<br> x<br> +<br> 6
den301095 [7]

Answer:

2

+

8

+

6Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Rewrite the following equation in slope-inte
Nonamiya [84]

Answer:

y = 13x + 86

Step-by-step explanation:

y−8 =13(x+6); distribute the 13

y - 8 = 13x + 78; now add 8 to both sides

y = 13x + 86; this is the slope intercept form

7 0
3 years ago
Other questions:
  • Type of Cookie
    9·1 answer
  • 1. The gaming company whose console received the video game market in 1985 was.
    8·1 answer
  • Is there anyone that’s good with geometry? If so please help
    15·2 answers
  • What's 2+2? I'm in 8th can't figure it out
    8·2 answers
  • if the national economy shrank an annual rate of 10% per year for four consecutive years in the economy shrank by 40% over the f
    12·1 answer
  • Deku and reaper also what is 2-4=?
    12·1 answer
  • 2) A recent survey of 2625 elementary school children found that 28% of the children could be classified obese.
    15·1 answer
  • HELLLLPPPP ME OUUT PLLLSDDEE
    12·1 answer
  • 10°<br> 55°<br> x х<br> Solve for y in the figure above.
    8·1 answer
  • Can I get help please?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!