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3 years ago

What is equivalent to -5(x2+3)-2x(x-4)

Mathematics

1 answer:

tensa zangetsu [6.8K]3 years ago

3 0

Answer:

-2x²-2x-15

Step-by-step explanation:

-5(2x+3)-2x²+8x

-10x-15-2x²+8x

-2x-15-2x²

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If 3 : 5 :: x : 45, then the value of x ?

iren2701 [21]

Answer:

Answer below in the picture:-

I hope it helps.

4 0

3 years ago

The temperature is 60°F. The temperature will decrease by 3°F each hours. Let h be the number of hours. When will the temperatur

lisabon 2012 [21]

Answer:

For the temperature to be below 32 F, following inequality must be met,

$h\geq 9.333$

Step-by-step explanation:

Let "t" be the temperature at any time.

General format of a linear equation can be given as,

y= mx + c

Where,

y ⇒ dependent variable ( in this case temperature t)

m⇒ Gradient ( the rate at which the temperature drops)

x⇒ independent variable ( hours )

c⇒ intercept ( this is the starting temperature)

Now we can substitute the given values to the above format to arrive at the equation,

$t=-3h+60$

We can re-arrange the equations as ,

$3h=60-t$

= $h=20-\frac{t}{3}$

We can write this as an inequality when t = 32 F

$h\geq 20-\frac{32}{3}$

= $h\geq \frac{28}{3}$

= $h\geq 9.333$

7 0

3 years ago

Number two please ASAP

miv72 [106K]

The solutions for $-5 +2x^{2} = -6x$ is option 3. $x= \frac{-6 \pm \sqrt{36-4 (2)(-5)}}{4} .$

Step-by-step explanation:

Step 1:

First, we must bring the equation to the form of $ax^{2} +bx +c =0.$

So $-5 +2x^{2} = -6x$ becomes $2x^{2} +6x-5=0.$

The value of a is the coefficient of the $x^{2}$ term, the value of b is the coefficient of x term and c is the coefficient of the constant term.

Comparing the above equation to $ax^{2} +bx +c =0,$ we get $a = 2, b = 6,$ and $c=-5.$

We have the formula $x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}.$

Step 2:

By substituting the known values, we get

$x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a} =\frac{-6 \pm \sqrt{6^{2}-4 (2)(-5)}}{2 (2)}.$

$\frac{-6 \pm \sqrt{6^{2}-4 (2)(-5)}}{2 (2)} = \frac{-6 \pm \sqrt{36-4 (2)(-5)}}{4} .$

This is the third option.

8 0

4 years ago

Substitute the value n = 4 in the expressions 2n n + 2 3(n+4)

Lelu [443]

Step-by-step explanation:

Given n = 4

2n = 2* 4= 8

n + 2 = 4 + 2 = 6

3(n + 4) = 3( 4 + 4) = 3 * 8 = 24

Hope it will help :)

4 0

3 years ago

What is 2 (x-3) -(6x-4)

docker41 [41]

Answer:

simplify = - 4 x -2 factored = 2 (-2x - 1)

Step-by-step explanation:

5 0

3 years ago