All categories

4 years ago

If a square has a length of 3x-y, what is its area?

Mathematics

1 answer:

SVEN [57.7K]4 years ago

7 0

Answer:

9x² -6xy +y²

Step-by-step explanation:

The square of the binomial can be written directly using the relationship ...

(a +b)² = a² +2ab +b²

where you have a=3x and b=-y.

area = (3x -y)² = (3x)² + 2(3x)(-y) + (-y)²

area = 9x² -6xy +y²

You might be interested in

Please help 7th ac math

UNO [17]

Answer:

1/2x

Step-by-step explanation:

$\frac{\frac{1}{4}+x *\frac{2}{1} }{\frac{1}{2}\frac{2}{1} } =\frac{2}{4} + 2x= \frac{1}{2} + 2x$

To solve this type of fraction you need to times the inverse of the bottom fractal, both over and under. In this case the inverse of 1/2 is 2/1

5 0

3 years ago

find the surface are of a cylinder with a base diameter of 12 in and a height of 8 m use the value 3.14 for pi and do not do rou

alukav5142 [94]

Answer:

527.52 is your answer.

5 0

4 years ago

*5) x—> 1 — x<br><br> Help please will really appreciate it

Paha777 [63]

Hey I’m sorry but I do not know the answer.

3 0

3 years ago

Please determine the conjugate of 9 - 3i ?

Kazeer [188]

Step-by-step explanation:

You find the complex conjugate simply by changing the sign of the imaginary part of the complex number.

the answer is

9+3i

7 0

2 years ago

Read 2 more answers

What is the area of a triangle with vertices (3,0) (9,0) (7,6)

Nezavi [6.7K]

Answer:

The area of the triangle is of 21 units of area.

Step-by-step explanation:

The area of a triangle with three vertices $(x_1,y_1),(x_2,y_2),(x_3,y_3)$ is given by the determinant of the following matrix:

$A = \pm 0.5 \left|\begin{array}{ccc}x_1&y_1&1\\x_2&y_2&1\\1_3&y_3&1\end{array}\right|$

In this question:

Vertices (3,0) (9,0) (7,6). So

$A = \pm 0.5 \left|\begin{array}{ccc}3&0&1\\9&0&1\\7&7&1\end{array}\right|$

$A = \pm 0.5(3*0*1+0*1*7+1*9*7-0*7*1-0*9*1-3*1*7)$

$A = \pm 0.5*(63-21)$

$A = \pm 0.5*42 = 21$

The area of the triangle is of 21 units of area.

5 0

3 years ago