3 years ago

2. Solve x2 + 2x + 7 = 0 using the Quadratic Formula

Mathematics

2 answers:

pantera1 [17]3 years ago

5 0

Answer:

x=7/4

Step-by-step explanation:

4x=-7=4x/-4=-7/-4= x=7/4

Alchen [17]3 years ago

3 0

Answer:

-1 ± i√7

Step-by-step explanation:

x² + 2x + 7 = 0
D = 2² - 4*7 = 4 - 56 = -52
x = (-2 ± √-28)/2 = (-2 ± 2√-7)/2 = -1 ± i√7

You might be interested in

Which system of equations below has no solution?

shutvik [7]

A. 4x+5=4x-5
4x+10=4x
10=0

B. 4x+5=4x+5

C.4x+5=1/4+5
4x=1/4
16x=1
x=16

D. 4x+5=8x+10
-4x=5
x=-5/4

A. has no solution

7 0

4 years ago

Read 2 more answers

Lance bought a used car for $5500. He sold it two years later for $2475. What is the percent change of the price?

Rufina [12.5K]

Answer: 55%

Step-by-step explanation:

2475/5500 = .45

He sold it for 45% of the price, so it went down by 55%

4 0

4 years ago

The perimeter of a rectangle is 126cm. The rectangle is twice as long as it is wide. What are

RSB [31]

Answer:

the length is 31.5 and the width is 15.75

Step-by-step explanation:

6 0

3 years ago

Which of the following best describes the expression 3x + 2 y + 8

krek1111 [17]

The product of three sums; there are three terms

3 0

3 years ago

Read 2 more answers

Solve the system of equations using elimination/ combinations.<br> -2x - y= -4<br> x+ 2y = 5

dusya [7]

If $-2x-y=-4$ and $x+2y=5$ , notice that

$(-2x-y)+2(x+2y)=-4+2\cdot5\implies3y=6\implies y=2$

Then

$x+2\cdot2=5\implies x=1$

7 0

3 years ago

2. Solve x2 + 2x + 7 = 0 using the Quadratic Formula​

2. Solve x2 + 2x + 7 = 0 using the Quadratic Formula