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3 years ago

3-5(a-4) pls heeeeeeellllp

Mathematics

2 answers:

aleksandrvk [35]3 years ago

4 0

Answer:

-5a + 23

Step-by-step explanation:

Step 1: Distribute.

$3 + (-5)(a)+(-5)(-4)$
$3 -5a + 20$

Step 2: Combine like terms.

$(-5a)+(20+3)$
$-5a + 23$

Therefore, the answer is -5a + 23.

vovangra [49]3 years ago

4 0

Answer:

−5+23

Step-by-step explanation:

3-5+20

23-5

-5+23

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9/20

Stella [2.4K]

Question:

Find the number of real number solutions for the equation. x^2 + 5x + 7 = 0

Answer:

The number of real solutions for the equation $x^{2}+5 x+7=0$ is zero

Solution:

For a Quadratic Equation of form : $a x^{2}+b x+c=0$ ---- eqn 1

The solution is $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$

Now , the given Quadratic Equation is $x^{2}+5 x+7=0$ ---- eqn 2

On comparing Equation (1) and Equation(2), we get

a = 1 , b = 5 and c = 7

In $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$ , $b^2 - 4ac$ is called the discriminant of the quadratic equation

Its value determines the nature of roots

Now, here are the rules with discriminants:

1) D > 0; there are 2 real solutions in the equation

2) D = 0; there is 1 real solution in the equation

3) D < 0; there are no real solutions in the equation

Now let solve for given equation

$D= b^2 - 4ac\\\\D = 5^2 - 4(1)(7)\\\\D = 25 - 28 \\\\D = -3$

Since -3 is less than 0, this means that there are 0 real solutions in this equation.

4 0

4 years ago

What curve passes through the point (1 ,2) and has an arc length on the interval [2,6] given by Integral from 2 to 6 StartRo

Georgia [21]

Answer:

Step-by-step explanation:

Given

Length of curve

$L=\int_{2}^{6}\sqrt{1+64x^{-6}}dx$

Length of curve is given by

$L=\int_{a}^{b}\sqrt{1+\left ( \frac{\mathrm{d} y}{\mathrm{d} x}\right )^2}dx$ over interval a to b

comparing two we get

$\frac{\mathrm{d} y}{\mathrm{d} x}=8x^{-3}$

$dy=8x^{-3}dx$

integrating

$\int dy=\int 8x^{-3}dx$

$y=-4x^{-2}+C$

Curve Passes through (1,2)

$1=-4+C$

$C=5$

curve is

$y+\frac{4}{x^2}=5$

3 0

3 years ago

An irrational number is one that simply can not be worked into any equation.

Fudgin [204]

Answer:

it can be use in equation

An irrational number is a number that cannot be expressed as a fraction for any integers and. . Irrational numbers have decimal expansions that neither terminate nor become periodic.

5 0

2 years ago

Ravi lost 80 dollars from his pocket. Write a signed number to represent this change.

Mariana [72]

Answer:

x - 80

Step-by-step explanation:

Ravi had x dollars in all.

x - 80

5 0

3 years ago

Please help and explain

Alja [10]

corn = 15%

angle = (15/100)×360

= 54°

7 0

3 years ago

3-5(a-4) pls heeeeeeellllp​

3-5(a-4) pls heeeeeeellllp