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kozerog [31]
4 years ago
15

Use the quadratic formula to solve the equation: 0 = x2 + x - 20

Mathematics
1 answer:
Art [367]4 years ago
7 0

Answer:

(x-4)*(x+5) : x =4,-5

Step-by-step explanation:

a= 1

b= 1

c= -20

x1,2 = (-1+-(1 - (4*1*-20))^0.5)/2

x1,2 = (-1+-(1+80)^0.5)/2

x1,2 = (-1+-(81^0.5))/2

x1,2 =(-1+-9)/2

x1 = 8/2 = 4 x2 = -10/2 = -5

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Simplify the expression.<br><br> 6x - 3 -9x - 2 Like terms
Alexeev081 [22]

6x-3-9x-2

6x-9x = -3x

-3-2 = -5

the the equation is: -3x-5

5 0
4 years ago
- 3(4 - 9)<br><br> Evaluate.
snow_lady [41]

Answer:

-15

Step-by-step explanation:

4-9=-5 -5×-3=15

negative times negative is positive

4 0
3 years ago
Read 2 more answers
A company makes Citi bikes. 95% (i.e., 0.95) pass final inspection. Suppose that 5 bikes are randomly selected.
Phoenix [80]

Answer:

Hi myself Shrushtee.

Step-by-step explanation:

Given,

p=0.95

n=5

1-p = q =1-0.95=0.05

a)Probability that exactly 4 of these 5 sports bikes pass final inspection =0.2036

b)Probability that less than 3 of these 5 sports bikes pass final inspection =0.0012

Please mark me as brainleist

8 0
3 years ago
If z varies inversely as w^2, and z=10 when w=6, find z when w=2
Dmitry [639]

Answer:

90

Step-by-step explanation:

If z varies inversely as w^2 then:

z=k/(w^2)  

z=10 when w=6:

10=k/36---> k=360

z=k/2^2

z=360/4=90

4 0
3 years ago
What is the equation of the line that passes through the points (–12, –8) and (–17, –16)?
horsena [70]

Answer:

<em>firstly</em><em> find</em><em> the</em><em> gradient</em><em> given</em><em> by</em><em> the</em><em> equation</em>

<em>m=</em><em>y2-y1</em><em>/</em><em>x2-x1</em>

<em>in this </em><em>case</em><em> </em><em>x1 </em><em>is </em><em>-</em><em>1</em><em>2</em><em>,</em><em>x2 </em><em>is </em><em>-</em><em>1</em><em>7</em><em>,</em><em> </em><em>y1 </em><em>is </em><em>-8 </em><em>and </em><em>y2 </em><em>is</em><em>-</em><em>1</em><em>6</em>

<em>m=</em><em>-</em><em>1</em><em>6</em><em>+</em><em>8</em><em>/</em><em>-</em><em>1</em><em>7</em><em>+</em><em>1</em><em>2</em>

<em> </em><em> </em><em> </em><em>=</em><em>-</em><em>8</em><em>/</em><em>-</em><em>5</em><em> </em><em>or1.</em><em>6</em>

<em>then</em><em> </em><em>use </em><em>the </em><em>equation</em>

<em>y-y1</em><em>=</em><em>m(</em><em>x-x1</em><em>)</em>

y+8=1.6(x+12)

y+8=1.6x+19.2

y=1.6x+11.2

I hope this helps and sorry if it's wrong

4 0
3 years ago
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