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Ierofanga [76]
3 years ago
12

Expand.If necessary, combine like terms.(2+7x)(2-7x)stuck? Watch a vide​

Mathematics
2 answers:
m_a_m_a [10]3 years ago
8 0

Answer:4-49x^2

Step-by-step explanation:

2^2-(7x)^2= given ans

scoray [572]3 years ago
3 0

Answer:

\boxed{\bold{-49x^2+4}}

Explanation:

Apply Difference of Two Squares Formula: \bold{\left(a+b\right)\left(a-b\right)=a^2-b^2}

\bold{a=2,\:b=7x}

= \bold{2^2-\left(7x\right)^2}

Simplify \bold{2^2-\left(7x\right)^2: \ -49x^2+4}

\boxed{\bold{-49x^2+4}}

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what is a more accurate method for approximating the volume of the spherical slab other than using just cylindrical slabs.
jasenka [17]

A more accurate method for approximating the volume of the spherical slab other than using just cylindrical slabs is the; use the cross sections of the actual sphere, and to not use the cylindrical slabs.

<h3>What is a Cylinder?</h3>

A Cylinder is a surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.

Sphere

This is a regular three-dimensional object in which every cross-section is a circle; the figure described by the revolution of a circle about it's diameter.

Therefore, the use of cross sections of the actual sphere is a more accurate method for approximating the volume of the spherical slab.

Learn more about cylindrical slab:

brainly.com/question/9554871

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6 0
1 year ago
What is the value of w? 28=4(w−3)
sveticcg [70]

Answer:

w=10

Step-by-step explanation:

1. Divide 4 on both sides to cancel out the 4 on the right side since it is an equation so it has to remain “equal”/ balanced.

2. You get 7=w-3.

3. Add 3 on both sides.

4.You get w=10.

7 0
3 years ago
Read 2 more answers
The cost of a book is $x what is the expression in terms of x for the number of these books which are bought for $40
spayn [35]

Answer:

In x dollars,

number of book that can be bought = 1

So, In 1 dollar,

number of books that can be bought = 1/x

Hence in 40 dollars,

number of books that can be bought = 40/x

6 0
2 years ago
Read 2 more answers
Question 4a: Determine which car is traveling faster.
meriva

Answer:

110 ft per sec is faster than 60 mph

Step-by-step explanation:

110 ft per second is 396,000 feet per hour

396,000 feet equals 75 miles because there are 5,280 feet in one mile

so, 110 ft per sec is 75 miles per hr

6 0
3 years ago
40,43,40,39,50,23 what is the median?
Effectus [21]
Median is the middle number, but since there is 6 numbers.
Put them in order first
23,39,40,40,43,50
Well in middle is 40 for both sides
So to solve median for this you'd add the two middle numbers together since there is even set of numbers.
40+40 =80 then divide by 2
80÷2=40
Median = 40
*Follow This Example for any other even sets of numbers for Median*
4 0
3 years ago
Read 2 more answers
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