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3 years ago

(x+1)^2-(x-1)^2 dont kbow what to do

Mathematics

1 answer:

marshall27 [118]3 years ago

6 0

Use this formula a2 − b2 = (a + b)(a − b)

(x+1)^2-(x-1)^2 in this case, a = x+1, b = x-1

= [(x+1) + (x-1)] * [(x+1) – (x-1)]

=(x +1 + x – 1) *(x +1 – x +1)

= 2x * 2

=4x

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When cooking a certain type of rice, the ratio of water to rice should always be 3 to 2. The table below shows this relationship

Komok [63]

Answer/Step-by-step explanation:

3:2 = 6:4 = 15:10

Check work:

3 ÷ 2 = 1.5

6 ÷ 4 = 1.5

15 ÷ 10 = 1.5

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2 years ago

The point of a square pyramid is cut off, making each lateral face of the pyramid a trapezoid with the dimensions shown.

omeli [17]

Answer:

The area of one trapezoidal face of the figure is 2 square inches

Step-by-step explanation:

The complete question is

The point of a square pyramid is cut off, making each lateral face of the pyramid a trapezoid with the dimensions shown. What is the area of one trapezoidal face of the figure?

we know that

The area of a trapezoid is given by the formula

$A=\frac{1}{2}(b_1+b_2)h$

where

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h is the height of the trapezoid (perpendicular distance between the parallel sides)

we have

$h=1\ in\\b_1=1\ in\\b_2=3\ in$

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8 0

3 years ago

Read 2 more answers

Identify the property used in the first five steps to solve the equations (2x-5)-6x=-22

Bad White [126]

Combine like terms
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3 years ago

Prove the following statement.

gayaneshka [121]

Answer:

You can prove this statement as follows:

Step-by-step explanation:

An odd integer is a number of the form $2k+1$ where $k\in \mathbb{Z}$ . Consider the following cases.

Case 1. If $k$ is even we have: $(2k+1)^{2}=(2(2s)+1)^{2}=(4s+1)^{2}=16s^2+8s+1=8(2s^2+s)+1$ .

If we denote by $m=2s^2+2$ we have that $(2k+1)^{2}=8m+1$ .

Case 2. if $k$ is odd we have: $(2k+1)^{2}=(2(2s+1)+1)^{2}=(4s+3)^{2}=16s^2+24s+9=16s^{2}+24s+8+1=8(2s^{2}+3s+1)+1$ .

If we denote by $m=2s^{2}+24s+1$ we have that $(2k+1)^{2}=8m+1$

This result says that the remainder when we divide the square of any odd integer by 8 is 1.

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3 years ago

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zheka24 [161]

Answer:

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2 years ago