Ask question

Ask question

All categories

3 years ago

10

Expand and simplify (3x+5)(4x-1)

1 answer:

Whitepunk [10]3 years ago

5 0

Use FOIL and simply, First times First, Outside times Outside, Inside times Inside, Last times Last.

(3x+5)(4x-1)
3x * 4x = 12x²
3x * -1 = -3x
5 * 4x = 20x
5 * -1 = -5

12x² - 3x + 20x - 5

Now simplify by adding -3x to 20x and get:

12x² + 17x - 5

You might be interested in

Convert a recipe that serves 6 and calls for 3/4 cups of sugar to one that serves 20.

djyliett [7]

Answer:

5/2cups

Step-by-step explanation:

If a recipe serves 6 and calls for 3/4cups, arecipe that serves 20, will call for (20×3/4)/6 cups. Mathematically;

6recipe = 3/4cups

20recipe = x

Cross multiplying we have;

6x = 20×3/4

6x = 15

x = 15/6

x = 5/2

This means a recipe that serves 20 will call for 5/2cups

3 0

3 years ago

The short hand on a clock is between the 10 and the 11. The long hand is pointing to the 5.

olga_2 [115]

That would mean it would be 10:25

4 0

3 years ago

A scale drawing of a square has a side length of 6 millimeters. The drawing has a scale of 1 mm : 7 km. Find the actual perimete

zvonat [6]

Answer:

The real perimeter is:

$P= 24 mm *\frac{7 km}{1mm}= 168 km$

And the area would be:

$P = 36mm^2 *\frac{(7km)^2}{(1mm)^2} = 1764 km^2$

Step-by-step explanation:

For this case we know one side of a square given 6mm.

We can begin calculating the perimeter for the scale figure with this formula:

$P = 4x = 4*6 mm =24 mm$

The area for this case is given by:

$A = x^2 = 6mm^2 = 36 mm^2$

And we know that the drawing has a scale of 1 mm : 7 km and if we convert the perimeter to km we got:

$P= 24 mm *\frac{7 km}{1mm}= 168 km$

And the area would be:

$P = 36mm^2 *\frac{(7km)^2}{(1mm)^2} = 1764 km^2$

6 0

3 years ago

X^2=20 square root property

Dmitriy789 [7]

${x}^{2} = 20 \\ x = \sqrt{20} \\ x = \sqrt{4} \times \sqrt{5} = 2 \times \sqrt{5} \\ \\ x = 2 \sqrt{5} \\ therefore \: \: x = 2\sqrt{5}$

4 0

3 years ago

G(x)=(x2+4x-12)(x-3)

tatuchka [14]

Answer:answer is a

Step-by-step explanation:

5 0

3 years ago