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2 years ago

Please help me on this question hery hard 5x5=

Mathematics

2 answers:

konstantin123 [22]2 years ago

7 0

Answer:

Step-by-step explanation:

natka813 [3]2 years ago

7 0

Answer: 25

Step-by-step explanation:

5+5+5+5+5=25

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Find the discriminant, and determine the number of real solutions. then solve x^2 +8x+20=0

vodomira [7]

Answer:

Part 1) The quadratic equation has zero real solutions

Part 2) The solutions are

$x_1=-4+2i$ and $x_2=-4-2i$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}+8x+20=0$

$a=1\\b=8\\c=20$

The discriminant is equal to

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

If D=0 -----> the quadratic equation has only one real solution

If D>0 -----> the quadratic equation has two real solutions

If D<0 -----> the quadratic equation has two complex solutions

<em>Find the value of D</em>

$D=8^{2}-4(1)(20)=-16$ -----> the quadratic equation has two complex solutions

<em>Find out the solutions</em>

substitute the values of a,b and c in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(20)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{-16}} {2}$

Remember that

$i=\sqrt{-1}$

$x=\frac{-8(+/-)4i} {2}$

$x_1=\frac{-8(+)4i} {2}=-4+2i$

$x_2=\frac{-8(-)4i} {2}=-4-2i$

8 0

3 years ago

Tamir wants to build a square wooden stage. His original pin for a stage x

shepuryov [24]

Answer:

b .

Area=(x-5) (x-3)

Area = x^2 -8x+15

Step-by-step explanation:

Hi, to answer this question we have to apply the next formula:

Area of a rectangle = width x length

The original length and width was x, so if the stage needs to be 5 feet narrower and 3 feet shorter.

x-5

The formula is:

A=(x-5) (x-3)

Solving:

A = (x.x) + (x.-3) + (-5.x)+ (-5.-3)

A = x^2 -3x -5x+15

A = x^2 -8x+15

6 0

3 years ago

HELP ME PLEASE WITH THIS

solniwko [45]

Correct Answer: 65 degrees Fahrenheit

8 0

2 years ago

A leak in a pool causes the height of the water to decrease by 0.25 foot over 2 hours. After the leak is fixed, the height of th

slavikrds [6]

Answer:

Assuming the leak took 2 hours to fix, the original height of the pool is 5 feet.

Step-by-step explanation:

This is probably the most simple "high school" problem I've seen in a while. All you have to do is move the negative 0.25 to the other side to isolate x. That gives you 4.75 + 0.25, or 5 feet.

5 0

3 years ago

Read 2 more answers

Hurry please thank u if u answer

AlekseyPX

Answer:

Step-by-step explanation:

<C = 180 - 140 = 40 deg

180 = 40 + 2x + (x+2)....... x= 46

<B = 2x = 2*46 = 92 deg ans

6 0

3 years ago