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horsena [70]
3 years ago
15

Solve the quadratic equation by using either numeric or graphic approach x^2 + 2x - 3 = 0

Mathematics
2 answers:
fomenos3 years ago
8 0

Answer:

d

Step-by-step explanation:

x 1=  \frac{ - b +  \sqrt{ {b}^{2}  - 4ac} }{2a}  \\ x2 =  \frac{ - b  -   \sqrt{ {b}^{2} -  4ac} }{2a}  \\ x1 =  \frac{ - 2 +  \sqrt{ {2}^{2}  - 4\times 1 \times ( - 3)} }{2}  = 1 \\ x2 =   \frac{ - 2 -  \sqrt{ {2}^{2}  - 4 \times 1 \times ( - 3)} }{2}  =  - 3

ser-zykov [4K]3 years ago
7 0

Answer:

d

Step-by-step explanation:

Solving by factorising

Given

x² + 2x - 3 = 0 ← in standard form

(x + 3)(x - 1) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 3 = 0 ⇒ x = - 3

x - 1 = 0 ⇒ x = 1

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Chandra bowled five games. Her scores were 89, 97, 112, 104, and 113. What is her mean score for the five games?
horrorfan [7]
103 because you have to add all the numbers up then divide that number by however many numbers there are to get mean.
3 0
2 years ago
Jordan eats 1/4 of an orange in 1/2 minute how much time will he need to eat a full orange
xxTIMURxx [149]

Answer:he will need 2 minutes to eat the orange

Step-by-step explanation:

Because half of a minute is 30 seconds meaning that for every fourth he eats he adds on one fourth so by one minute he’ll have 2/4 done by 1 minute and 30 seconds he’ll have 3/4 done and by 2 minutes he’ll 4/4 done hope this helps

7 0
3 years ago
Can you help me with my homework please
umka21 [38]

#4(a)

row-seat: 3- 13, 4-15, 5-17, 6-19, 7-21

(b)

the equation works for row 1 but not for any of the rows after this

Ex: Row 2, S=7(2)+2, this would equal 14 but there isn't 14 seats in row #2

(c)

S=2(1)+7, there is 9 seats in row 1

2(2)+7=11,  there is 11 seats in row 2

2(3)+7= 13, there is 13 seats in row 3

(d)

2(15)+7=37

2*15=30, 30+7=37

(e)

91=2(r)+7

91-7=2(r)+7-7

84=2(r)

84/2=2(r)/2

42=r, the row with 91 seats is row 42


3 0
3 years ago
Two types of tickets were sold for an upcoming concert: adult tickets and child tickets. In total, there
Alona [7]

Answer:

Adult ticket is $60

Child ticket is $32

Step-by-step explanation:

Let x = price of adult ticket

     y = price of child ticket

(1)    175x + 103y = 13796               (2)    2x + 2y = 184

                                                                 x + y = 92

                                                                       y = 92 - x

      175x + 103(92 - x) = 13796

      175x + 9476 - 103x = 13796

       72x = 4320

           x = 60                                                  y = 92 - 60

                                                                        y = 32

4 0
2 years ago
DO IT AND YOU GET 50 POINTS BUT IF YOU DO BOTH PAGES YOU GET BRAINLEYIST AWNSER.
jeyben [28]

Answer:

23. a-T b-F

24. Words- *3* times the number of *feet*

     Variable- Let *y* represent the number of *yards*

     Model- (I can't do it)

     Expression- The number of feet in*3* yards is given by the expression *3y*

25. 7.8

26. 8.3

27. 14.5

28. Yes. The communitive property tells us that we can switch any two numbers in a multiplication or addition problem

*I did that page like a month ago*

5 0
3 years ago
Read 2 more answers
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