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3 years ago

Help me please, i need this answer I don't know what it is.

Mathematics

1 answer:

tekilochka [14]3 years ago

8 0

I think the answer has something to do with math

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I'm Begging for somebody to do this worksheet. I can mark you brainiest and you will earn 15 points just please anybody? AND SAY

ser-zykov [4K]

(2) 2x
Bc you’re adding the imaginary one infront of the x.

(1) X squared + 25
Distribution

(3) 15x-30
Distribution

(1) x to the 6 power
You add the powers when they are being multiplied

(2) 2x squared + 7x + 12
Foil method

(2) 9x + 20
Adding Like terms

(4) 12x + 25
Adding and multiplying like terms

(2) 19x + 7
Multiplying then adding like terms.

I hope this helps ;)

Mark me brainliest please! ;D

5 0

3 years ago

Find the absolute maximum and absolute minimum values of the function f(x, y) = x 2 + y 2 − x 2 y + 7 on the set d = {(x, y) : |

dsp73

Looks like $f(x,y)=x^2+y^2-x^2y+7$ .

$f_x=2x-2xy=0\implies2x(1-y)=0\implies x=0\text{ or }y=1$

$f_y=2y-x^2=0\implies2y=x^2$

If $x=0$ , then $y=0$ - critical point at (0, 0).
If $y=1$ , then $x=\pm\sqrt2$ - two critical points at $(-\sqrt2,1)$ and $(\sqrt2,1)$

The latter two critical points occur outside of $D$ since $|\pm\sqrt2|>1$ so we ignore those points.

The Hessian matrix for this function is

$H(x,y)=\begin{bmatrix}f_{xx}&f_{xy}\\f_{yx}&f_{yy}\end{bmatrix}=\begin{bmatrix}2-2y&-2x\\-2x&2\end{bmatrix}$

The value of its determinant at (0, 0) is $\det H(0,0)=4>0$ , which means a minimum occurs at the point, and we have $f(0,0)=7$ .

Now consider each boundary:

If $x=1$ , then

$f(1,y)=8-y+y^2=\left(y-\dfrac12\right)^2+\dfrac{31}4$

which has 3 extreme values over the interval $-1\le y\le1$ of 31/4 = 7.75 at the point (1, 1/2); 8 at (1, 1); and 10 at (1, -1).

If $x=-1$ , then

$f(-1,y)=8-y+y^2$

and we get the same extrema as in the previous case: 8 at (-1, 1), and 10 at (-1, -1).

If $y=1$ , then

$f(x,1)=8$

which doesn't tell us about anything we don't already know (namely that 8 is an extreme value).

If $y=-1$ , then

$f(x,-1)=2x^2+8$

which has 3 extreme values, but the previous cases already include them.

Hence $f(x,y)$ has absolute maxima of 10 at the points (1, -1) and (-1, -1) and an absolute minimum of 0 at (0, 0).

3 0

3 years ago

The area of a rectangle is 72 cm square. The length of the rectangle is 6 cm longer than the width. What is the width of the rec

tangare [24]

The answer is B: 6 cm. You can use guess-and-check method, and plug the possible different answers into the equation x(x+6)=72, x stands for the width.

4 0

3 years ago

Rewrite 3/100 as the sum of unit fractions

Bingel [31]

1/100+1/100+1/100 Hope this helped! I remember taking this unit in Elementary. Good luck!

6 0

3 years ago

Simplify. 4*3 · 4*4

viktelen [127]

A)4*16

because 4*3•4*4•4*9
you have to add the exponents

3+4+9=16
keep the number

so 4*16 is the answer

4 0

3 years ago