All categories

3 years ago

More points for my easy questions (fair deal)

Mathematics

2 answers:

SIZIF [17.4K]3 years ago

7 0

Answer:

Step-by-step explanation:

(x + 4)³ is x + 4 cubed

(x + 4)³ + 3x is the sum of x + 4 cubed and 3x

Grace [21]3 years ago

5 0

Answer:

Step-by-step explanation:

The thing that is being cubed here is the sum of x and 4, not x or 4 individually. After you have taken care of what is in parentheses, you add 3x, which gives the sum of x+4 cubed and 3x. Hope this helps!

You might be interested in

2n²+3n=27 2t²-162=0 find the roots of each equation.

ASHA 777 [7]

Answer:

$n = 3, n=-\frac92; t=9, t=-9$

Step-by-step explanation:

Second one is faster, so let's get rid of it first.

Divide by 2 to make numbers easier, and we get

$t^2-81 = 0$ . You should recognize 81 is 9 squared, and both $-9$ and $+9$ , when squared, give 81, we have our solution.

Now the first. I can't spot any quick trick to solve it, so quadratic formula it is. Let's rememer it: if

$ax^2 +bx+c=0$ then

$x={{-b \pm \sqrt{b^2-4ac}}\over 2a$

Let's bring the first equation in the standard form and calculate the quantity over the square root (usually called with the greek letter delta, $\Delta$ ) to the side.

$2n^2+3n-27 =0\\\Delta = (3)^2 -4(2)(-27) = 9+(8)(3)(9) = 9(1+24)= 9 \cdot25 =(3\cdot5)^2$

now we can apply the formula:

$n={{-3\pm15}\over4}$ Let's split the two cases now

$n= \frac{-3+15}4 = \frac{12}4=3\\n= \frac{-3-15}4 = \frac{-18}4 =-\frac92$

5 0

3 years ago

Find the general linear equation (Ax+By+C=0) of a straight line that is horizontal and that passes through (-4,-2)

sukhopar [10]

Equation of line is:

$y+2 = 0$

Step-by-step explanation:

The slope is defined the rate of change of line w.r.t x. When a line is horizontal. it is parallel to x-axis which means that it's slope is equal to zero.

So the slope intercept form of equation

$y = mx+b$

become

$y = b$

Given point is: (-4,-2)

Putting the value of y in equation

$b = -2$

So the equation will become:

$y = -2$

It can also be written as:

$y+2 = 0$

Keywords: Equation of line, slope

Learn more about equation of line at:

#LearnwithBrainly

5 0

3 years ago

Please I really need answers.

lbvjy [14]

I agree with the person that commented first

8 0

3 years ago

Name the triangle congruent to ΔABC ΔABC≅Δ

goldfiish [28.3K]

Triangle QPR is equal to triangle ABC

8 0

3 years ago

Read 2 more answers

Please answer this question asap will be marked brainliest

Papessa [141]

Answer: 9.85 inches

Step-by-step explanation:

Each point on the graph represents the total rainfall in one month in this desert. For instance, the 2 points on top of 1.0 inches indicates that there were two months in the year where rainfall was 1.0 inches.

The total rainfall in this desert was therefore:

= 0.4 + 0.5 + 0.5+ 0.6 + 0.85 + 0.85 + 0.95 + 1.0 + 1.0 + 1.05 + 1.05 + 1.1

= 9.85 inches

4 0

3 years ago