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Sedbober [7]
3 years ago
14

Help me! Graph y=2x^2+5x-7

Mathematics
1 answer:
bija089 [108]3 years ago
7 0
Hey! I feel so sorry for you. I’ve been stuck with graph questions for a while now. They can be tricky, especially long equations like that. I snapshotted the graph I calculated for you.

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Solve this please .......​
nikdorinn [45]

Answer:

The sum of reciprocals is 2/3.

You don't need complex numbers to solve this, but if you try to find a and b you will need complex numbers.

Step-by-step explanation:

a+b = 2

a*b = 3

1/a + 1/b = x

(a*b)*(1/a + 1/b) = (a*b)x

b + a = (a*b)(x)

2 = 3x

x = 2/3

b = 2 - a

a*(2 - a) = 3

-a^2 + 2a = 3

-a^2 + 2a - 3 = 0

a^2 - 2a + 3 = 0

let's solve the quadratic equation

a^2 - 2a + 3 = a^2 - 2a + 1 + 2 = (a - 1)^2 + 2 = 0

(a - 1)^2 = -2

a_1 - 1 = \sqrt{2}i\\a_1 = 1+\sqrt{2}i\\\\a_2 - 1 = -\sqrt{2}i\\a_2 = 1 - \sqrt{2}i\\

these options correspond to a and b from the original question.

8 0
2 years ago
Which of the following represents the set of integers greater than or equal to -5?
Ann [662]
<span>B. {-5,-4,-3…. }
............</span>
8 0
3 years ago
Read 2 more answers
Do the sides 9, 12 and 15 make a right triangle?
Fynjy0 [20]

Answer:

YES

Step-by-step explanation:

because they are all different lengths  

6 0
3 years ago
Read 2 more answers
Find x. Then find the measure of angles A, B and C.
mafiozo [28]

Answer:

x= 11

A=59

B= 37

C = 84

Step-by-step explanation:

A triangle adds up to 180 °.

So the equation will be a °+ b° + c° = 180°

Next, you combine like terms.

6x + 3x + 9x+4-15-7 = 180\\18x-18=180

Then inverse operation,

18x-18=180\\18x=198\\x=11

After to get a, b, and c you just need to plug in x.

6(11)-7=a\\3(11)+4 = b\\9(11)-15=c

4 0
3 years ago
How do I solve this ?
noname [10]
The answer is around 29
8 0
3 years ago
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