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Ganezh [65]
3 years ago
7

How to use the zero product property and factoring solve for X

Mathematics
1 answer:
Marta_Voda [28]3 years ago
8 0
Using the zero product property you can set each expression equal to 0 (or factor for some of them)
All you have to do is set them equal to zero and simplify to solve for x

a. (x+13)=0
x= -13
(x-7)=0
x=7

b. (2x+3)=0
x=-3/2
(3x-7)=0
x=7/3

c. x=0
(x-3)=0
x=3

d. x^{2} -5x=0
 needs to be factored 
factor out an x to get:
x(x-5) and set each equal to 0
x = 0       
(x-5)=0 
x=5

e. x^{2} -2x-35=0
 also needs to be factored
(x-7)(x+5)=0
(x-7)=0       (x+5)=0
x=7   x=-5

f. 3x^{2} +14x-5=0
Also needs to be factored using the ac method:
3 x^{2} +15x-x-5
3 x^{2} (x+5)-1(x+5)
(3x-1)(x+5)=0

(3x-1)=0
x=1/3
(x+5)=0
x=-5

I hope this helps! (if so, give brainliest please!!)

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A piggy bank contains pennies, nickels, and dimes. The number of dimes is 15 more than the number of nickels, and there are 140
amm1812

Answer:

Option D is correct.

There are 34 nickels in the piggy bank.

Step-by-step explanation:

A piggy bank contains pennies, nickels and dimes.

Let the number of pennies be p

Let the number of nickels be n

Let the number of dimes be d

Also, note that 1 penny = $0.01

1 nickel = $0.05

1 dime = $0.10

- The number of dimes is 15 more than the number of nickels.

d = 15 + n

- There are 140 coins altogether totaling $7.17.

p + n + d = 140

0.01p + 0.05n + 0.1d = 7.17

Bringing the 3 equations together

d = 15 + n (eqn 1)

p + n + d = 140 (eqn 2)

0.01p + 0.05n + 0.1d = 7.17 (eqn 3)

Substitute (eqn 1) into (eqn 2)

p + n + d = 140

p + n + (15 + n) = 140

p + 2n + 15 = 140

p = 140 - 15 - 2n = 125 - 2n

p = 125 - 2n (eqn 4)

Substitute (eqn 1) and (eqn 4) into (eqn 3)

0.01p + 0.05n + 0.1d = 7.17

0.01(125 - 2n) + 0.05n + 0.1(15 + n) = 71.7

1.25 - 0.02n + 0.05n + 1.5 + 0.1n = 7.17

0.1n + 0.05n - 0.02n + 1.5 + 1.25 = 7.17

0.13n + 2.75 = 7.17

0.13n = 7.17 - 2.75 = 4.42

0.13n = 4.42

n = (4.42/0.13) = 34

d = 15 + n = 15 + 34 = 49

p = 125 -2n = 125 - (2×34) = 125 - 68 = 57

Hence, there are 57 pennies, 34 nickels and 49 dimes in the piggy bank.

Hope this Helps!!!

7 0
3 years ago
What is the answer ?how can I find it?
satela [25.4K]
The per store donated 11 and 3/8 pounds of cat food... first you gotta make the denominators equal so 19 and 3/4 becomes 19 and 6/8 then you add the puppy and dog food together (19 6/8 +18 7/8= 38 5/8) then you take 50 and subtract the value you just got (50 - 38 5/8) and you get tour answer at 11 and 3/8 pounds
6 0
3 years ago
The employees of a firm that manufactures insulation are being tested for indications of asbestos in their lungs. The firm is re
diamong [38]

Answer:

0.070

Step-by-step explanation:

Y = number on trial

Y has a negative binomial distribution

r = 3

P = 30% = 0.3 probability of positive indication.

P(Y = 11) probability of 11 employees that must be tested to get 3 positives

Y-1Cr-1*p^r*q^(y-r)

Y-1 = 11-1 = 10

r-1 = 3 -1 = 2

10C2 x 0.3³x0.7⁸

45x0.027x0.05764801

= 0.070

This is the probability that 11 employees must be tested to get 3 positives.

8 0
3 years ago
7+x=32 solve the equation
svlad2 [7]

Answer: x=25

Step-by-step explanation:

7+x=32 (subtract 7)

x=25

5 0
3 years ago
Read 2 more answers
Mrs. Toomer brought 40 cookies to school. Mrs. Toomer's class ate 1/2 the cookies. Mrs. Wilson's class ate 1/4 of the remaining
Arte-miy333 [17]
1/2 of 40 is 20, and the question says 1/4 of the REMAINING cookies, and 1/4 of 20 is 5. There are 3/4 left, or 15 cookies. I hope this helps!
3 0
3 years ago
Read 2 more answers
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