Sign In
Ask Question
Mathematics
Zoe Wilkins
3 August, 02:45
What are the roots of the equation x^2+3x-18=0
+2
Answers (
1
)
Damon Wolf
3 August, 03:27
0
First you open 2 parenthesis with x in each one:
(x) (x) = 0
Then, you place the sign of the second term (the x term) in the first parenthesis.
(x+) (x) = 0
Next, you multiply the signs of the x term and the sign of the constant (the third term).
Since + * - = -, then you place a -.
(x+) (x-) = 0
You look at the constant (-18) and the second term (3). What two numbers multiplied give you - 18 but subtracted (since the signs inside the parenthesis are opposite) give you 3? Those numbers are 6 and 3.
Since the result of the substraction need to be 3, you place the 6 with the + sign and the 3 with the negative sign (if you think of it, 6-3=3 but 3-6 = - 3. That's the reason behind placing the numbers)
(x+6) (x-3) = 0
Therefore,
x+6=0 or x-3=0
x=-6 or x=3
Your roots are - 6 and 3.
Comment
Complaint
Link
Know the Answer?
Answer
Not Sure About the Answer?
Get an answer to your question ✅
“What are the roots of the equation x^2+3x-18=0 ...”
in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers
You Might be Interested in
Diane goes to pay for her car parking. She arrived at the car park at 2.15pm and leaves at 4.45pm on Thursday. how much does Diane pay for her car parking? Monday - Fridayup to 2 hours £3.002-4 hours £4.505 hours + £5.50
Answers (1)
What two numbers multiply to get - 72 and add to get - 21
Answers (1)
Matt drives his car 20km to work everyday. What type of car insurance will he need?
Answers (2)
Find the domain of y = 2x + 1.
Answers (1)
In what situation do we need to use Substitution Rule? What is the purpose for using Substitution Rule?
Answers (1)
New Questions in Mathematics
Gabriella has 4 times as many erasers as leona. leona has 8 erasers. how many ererasers does gabriella have
Answers (1)
The mass of a moon 3.5 kilograms what is the mass of the moon rock in grams
Answers (1)
Which values of P and Q result in an equation with exactly one solution? Qx+12=13x+P a. Q=12 and P=-12 b. Q=-13 and P=13 c. Q=12 and P=12 d. Q=-13 and P=-13
Answers (1)
Kevin gave ben $4.90 in dimes and quarters. if 10 coins were quarters how many coins were dimes which equation models this problem
Answers (1)
How many parallel and perpendicular lines, are there in a trapezium?
Answers (1)
Home
»
Mathematics
» What are the roots of the equation x^2+3x-18=0
Sign In
Sign Up
Forgot Password?