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3 years ago

Which quadratic equation has no real roots?

Mathematics

2 answers:

Stella [2.4K]3 years ago

6 0

Answer:

The first choice and the last have no real roots.

Step-by-step explanation:

For an equation to have no real roots the value of the discriminant ( b^2 - 4ac) will be negative.

Working out the values:

1. D = (-2)^2 - 4* -1*-6 = -20 so it has no real roots.

2. D = (3)^2 - 4* -2* 4 = 41 so it does have real roots.

3. D = (1)^2 - 4* 2*-6 = 49 so real roots.

4. D = (-1)^2 - 4* 2*3 = -23 so no real roots

n200080 [17]3 years ago

3 0

Answer:

A and D

Step-by-step explanation:

By finding the roots of all the equations, we see that options A and D are the only ones that require an imaginary number in order to solve

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A newborn baby weighs 8 pounds and decreases his weight by 5% every week how much does the baby weigh after 20 weeks?

Feliz [49]

Answer:

in 20 weeks the baby will weigh nothing and is definitely dead

Step-by-step explanation:

5% of 8 is . 4

.4 x 20 is 8

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3 years ago

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*BRAINLIEST* (Easy Question: Warm UP) Find a positive solution to each equation: x2 = 9/4?

prisoha [69]

Answer:

A

Step-by-step explanation:

Given

x² = 9/4

Solving

Take the square root on both sides
√x² = √9/4
⇒ x = 3/2
Option A is the correct option.

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2 years ago

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What is the equation of the axis of symmetry of the graph of y+3x_6=-3(x_2)+4

agasfer [191]

Aos= -b/2a so plunin your numbers and you'll get the AOS so you can find the vertex

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3 years ago

Solve system of equations 2x + 2y + 5z = 7 6x + 8y + 5z = 9 2x + 3y + 5z = 6

svet-max [94.6K]

Answer:

the values of x, y and z are x= 2, y =-1 and z=1

Step-by-step explanation:

We need to solve the following system of equations.

We will use elimination method to solve these equations and find the values of x, y and z.

2x + 2y + 5z = 7 eq(1)

6x + 8y + 5z = 9 eq(2)

2x + 3y + 5z = 6 eq(3)

Subtracting eq(1) and eq(3)

2x + 2y + 5z = 7

2x + 3y + 5z = 6

- - - -

_____________

0 -y + 0 = 1

-y = 1

=> y = -1

Subtracting eq(2) and eq(3)

6x + 8y + 5z = 9

2x + 3y + 5z = 6

- - - -

______________

4x + 5y +0z = 3

4x + 5y = 3 eq(4)

Putting value of y = -1 in equation 4

4x + 5y = 3

4x + 5(-1) = 3

4x -5 = 3

4x = 3+5

4x = 8

x= 8/4

x = 2

Putting value of x=2 and y=-1 in eq(1)

2x + 2y + 5z = 7

2(2) + 2(-1) + 5z = 7

4 -2 + 5z = 7

2 + 5z = 7

5z = 7 -2

5z = 5

z = 5/5

z = 1

So, the values of x, y and z are x= 2, y =-1 and z=1

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3 years ago

Rule for raising a power to a new power

KiRa [710]

The practical rule would be, times that number, by the result of the first time you multiplied the first number. But, it would all depend by how much your're raising the number by.

For example: $\boxed{4^6}$

We do, $(4*4*4*4*4*4)= \boxed{\bf{4^6}}= 4096$

But, once again, this was an example. This would show and illustrate the rule of "raising a power".

5 0

3 years ago