Which is a solution to the equation?(x −2)(x + 5) = 18
x = −10
x = −7
x = −4
x = −2
Answers
(x - 2) * (x + 5) = 18
x^2 + 5x - 2x - 10 = 18
x^2 + 3x - 28 = 0
(x + 7) * (x - 4) = 0
1. x = - 7
2. x = 4
The correct result would be x = - 7.
The solutions to the equation are x = - 7 and x = 4
What are equation solutions?
Equation solutions are the true values of x in the equation
The equation is given as:
(x - 2)(x + 5) = 18
Expand the equation
x^2 + 5x - 2x - 10 = 18
Subtract 18 from both sides
x^2 + 3x - 28 = 0
Factorize the expression
(x + 7) * (x - 4) = 0
Solve for x
x = - 7 and x = 4
Hence, the solutions to the equation are x = - 7 and x = 4
Read more about quadratic equations at:
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A. 49x2 + 36
B. 49x2 - 84x + 36
C. 7x2 - 84x + 36
D. 7x2 + 36
Answers
(7x - 6)² becomes
(7x - 6)(7x - 6)
Next, we follow FOIL
First (The first term in the set 1 multiplied by the first term in set 2)
Outer (The first term in set 1 multiplied by the second term in set 2)
Inner (The second term in set 1 multiplied by the first term in set 2)
Last (The second term in set 1 multiplied by the second term in set 2)
F 7x x 7x = 49x²
O 7x x -6 = -42x
I -6 x 7x = -42x
L -6 x -6 = 36
Now, we add together all the terms
49x² + -42x + -42x +36
Adding a negative is the same as subtracting
49x² - 42x - 42x + 36
Finally, simplify (add together the like terms)
49x² -84x + 36
Answer:
Option B: 49x² -84x + 36
Step-by-step explanation:
Answers
Answers
Answer: Just follow the chart
Step-by-step explanation:
Answers
The probability of choosing a pink marble is # of pink marbles to # of all marbles which is 3/10. Since we place the marble back in the bag, the probability is the same for the second time.
To determine the probability of both occurrences, we need to multiply 3/10 x 3/10 which is 9/100. This can be written as 9:100 as a ratio.
Answers
Answer:y=9
Step-by-step explanation:
#no irrelevant answer
Answers
Given:
- A number is selected at random from the numbers 1 to 25.
- Each of the given numbers is equally likely to be selected.
To Find:
- Probability that the number is not a prime number.
Solution:
Required Sample space of the following event ( Non- prime numbers between 1 to 25 )
1, 4, 6, 8,9 10,12, 14, 15, 16,18, 20, 21, 22, 24, 25
Number of Favourable Outcomes = 16
Total number of outcomes = 25
Now as we know
Probability of an event =
Probability = 16/25
Hence, probability that the number is not a prime number is 16/25.
Answer:
Favourable outcomes = {1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25}
Number of favourable outcomes=16
Number of total possible outcomes=25
p(not a prime) = (number of favourable outcomes) / number of total possible outcomes
=16/25