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3 years ago

HELP ASAP !!!! I AM STUCK IN A MESS HELP !!!! Which is the correct answer !!!!

Mathematics

2 answers:

Pavlova-9 [17]3 years ago

7 0

I think it is a correct me if i am wrong

Rufina [12.5K]3 years ago

4 0

Answer:

Step-by-step explanation:

Im not sure if its correct tho dont quote me on it ;(

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If the discriminant of a quadratic equation is equal to -9, which statement describes the roots?

Mice21 [21]

ANSWER

No real roots.

The roots are complex or imaginary.

EXPLANATION

The quadratic equation

$a {x}^{2} + bx + c = 0$

has discriminant,

$D = {b}^{2} - 4ac$

If the discriminant is less than zero , then the quadratic equation has no real roots.

The given discriminant is -9.

Since -9 is less than zero, it means the quadratic equation has complex or imaginary roots.

8 0

3 years ago

What are the 4 different ways you can solve a quadratic equation.

mars1129 [50]

Answer:

$by \: using \: completing \: the \: square \: method \\ by \: using \: quadratic \: formula \: \: - b \: plus \: or \: minus \frac{ \sqrt{ {b}^{2} - 4ac } }{2a} \\ by \: factorizing \: \\ this \: it \: the \: only \: one \: i \: know \:$

5 0

3 years ago

Simplify 2x 2 - y for x = 3 and y = -2. 20 14 16 10 i need help please

disa [49]

2x^2-y

Plug in the values.

2(3)^2-(-2)

2(3)^2+2

Exponents first.

2*9+2

18+2

20

The answer is 20.

I hope this helps!
~kaikers

6 0

3 years ago

miv72 [106K]

Answer:

1. 1/2 in = 6 feet

1 3/4 in = 21 feet

2. x = 7

y = 10

3. GH= 2

4. x = 3

y = 5

7 0

2 years ago

Read 2 more answers

In a class of 7, there are 3 students who have done their homework. If the teacher chooses 3 students, what is the probability t

Vitek1552 [10]

The probability of the first one didn't do homework s 4/7,
the second is 3/6,
the third is 2/5,

Multiple all of them together
4/7*3/6*2/5=0.1143 or 11.43%

Answer:
0.1143 or 11.43%

4 0

3 years ago