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Allisa [31]
3 years ago
13

Use the quadratic formula to solve this equation to 3sf: 5x^2-2x-11=0

Mathematics
2 answers:
Rama09 [41]3 years ago
7 0
X=1/5+2/5√14 or 1/5 + -2/5√14
Evgen [1.6K]3 years ago
5 0
The quadratic formula is the result of completing the square for ax^2+bx+c=0 and it is:

x=(-b±√(b^2-4ac))/(2a)  in this case:

x=(2±√(4-4(5)(-11))/(2(5))

x=(2±√224)/10

x=(2±4√14)/10

x=(1±2√14)/5

x≈(-1.30, 1.70)  (to three significant figures)
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Is the equation y + 1=7(x+2) in point slope form
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8 0
3 years ago
Solve for y -3y-12=-4
Brilliant_brown [7]

Answer:

−8/3

Step-by-step explanation:

Step 1: Add 12 to both sides.

−3y−12+12=−4+12

−3y=8

Step 2: Divide both sides by -3.

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8 0
2 years ago
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harkovskaia [24]

Answer:

1 slope of f is 5

slop of g is 2

2. connor

initial value is 200

rate of change is -10

Pilar

initial value is 242

rate of change is -8

3.

y intercept of f is -3

y intercept of g is -1

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Dave has 8000 to invest for 15 years. He finds a bank that offers an interest rate of 3.1% compounded monthly. How much money wi
Lynna [10]

Answer: he will have $12720 after 15 years

Step-by-step explanation:

We would apply the formula for determining compound interest which is expressed as

A = P(1 + r/n)^nt

Where

A = total amount in the account at the end of t years

r represents the interest rate.

n represents the periodic interval at which it was compounded.

P represents the principal or initial amount deposited

From the information given,

P = $8000

r = 3.1% = 3.1/100 = 0.031

n = 12 because it was compounded 12 times in a year.

t = 15 years

Therefore,

A = 8000(1 + 0.031/12)^12 × 15

A = 8000(1 + 0.00258)^180

A = 8000(1.00258)^180

A = $12720

4 0
3 years ago
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