1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Scorpion4ik [409]
3 years ago
7

Expand if necessary combine like terms (7+x)(7-x)=

Mathematics
1 answer:
mina [271]3 years ago
4 0

Answer:

49 - x^2

Step-by-step explanation:

(7+x)(7-x)

We know this is the difference of squares

(a-b) (a+b) = a^2 - b^2

7^2 - x^2 = 49-x^2

We can also FOIL

first = 7*7 = 49

Outer: = 7x

Inner: = -7x

Last : -x*x = -x^2

Add them together

49 +7x-7x - x^2

Combine like terms

49-x^2

You might be interested in
A river flows due south at 4 mi/h. A swimmer attempting to cross the river heads due east swimming at 2 mi/h relative to the wat
Inessa05 [86]

Answer:

\overrightarrow{V_{S,G}}=2\widehat{i}-4\widehat{j} mi/h

Step-by-step explanation:

velocity of river with respect to ground = 4 mi/h south

\overrightarrow{V_{R,G}}=4(\widehat{-j})

Velocity of swimmer with respect to river = 2 mi/h east

\overrightarrow{V_{S,R}}=2(\widehat{i})

According to the formula of relative velocity

\overrightarrow{V_{S,R}}=\overrightarrow{V_{S,G}}-\overrightarrow{V_{R,G}}

2\widehat{i}=\overrightarrow{V_{S,G}}+4\widehat{j}

Where, V(S,G) be the velocity of swimmer with respect to ground, it is true velocity of swimmer.  

\overrightarrow{V_{S,G}}=2\widehat{i}-4\widehat{j} mi/h

5 0
3 years ago
PLEASE HELP!!! Geometry. Very simple question. I have made it worth 25 pints because I am feeling generous
weeeeeb [17]
37+21=58 is the answer.
6 0
3 years ago
Trina has 72 collector’s stamps. She puts 43 of the stamps into a stamp book. How many stamps are left?
sattari [20]

Hi! For this question all you have to do is subtract 43 from 72.

72 - 43 = 29

Trina had 29 stamps left.

Hope this helps! Happy Thanksgiving!

7 0
3 years ago
(13) The temperature on a cold winter day is 2 degrees below zero. In the night, the temperature drops an additional 14 degrees.
EastWind [94]
Well, in the first one, 2 degrees below zero is -2 degrees, and then it says that it dropped 14 degrees, which means it dropped -14 degrees, so to know the total amount it dropped you would just have to add -2 plus -14 which is -16 degrees, so your answer for the first question would be the last answer, -16 degrees.

For the second question, just know that whenever a negative number is BY ITSELF in parentheses, that means it is used like a positive number in the equation. So (-12) automatically becomes 12. Now, since the problem is asking for a SUM, (the answer to an ADDITION problem; when you add instead of subtract), you would turn that minus symbol to a plus symbol, and add normally to get your final answer; 30 + 12 = 42. To check if this is correct, just type in <span>30 – (–12) to a calculator and you'll get the same answer! :D
Hope this helps! :3</span>
5 0
3 years ago
Can someone help me with this problem please? Thank you!
Olenka [21]

Answer:

50

Step-by-step explanation:

since the Pythagorean theorem is

c= √a^2+b^2

b is the bottom line (48)

a is the right line (14)

c is the top line (c)

plug that in

c = √14^2 + 48^2

then do the exponets

14^2 = 14 * 14 = 196

48^2 = 48 * 48 = 2304

then add them together

196 + 2304 = 2500

c = √2500

the sqrt of 2500 is 50 (50 * 50 = 2500)

c = 50

your answer is 50

hope this helps:)

6 0
2 years ago
Read 2 more answers
Other questions:
  • Charlie runs at the speed of 3 yards per second. About how many miles per hour does Charlie runs?
    11·1 answer
  • Peaches are being sold for $2 per pound. If x represents the number of pounds of peaches bought and y represents the total cost
    7·2 answers
  • Solve the exponential equation for x
    11·2 answers
  • Is 4.70 greater than 4.07
    14·2 answers
  • Find the interest
    8·1 answer
  • I need your guys help on #36. HELP! :(
    9·1 answer
  • Find the area of the circle
    7·1 answer
  • Please help with these linear equations
    15·1 answer
  • Nikki read 896 pages of her book this week. how many pages is this per day?
    11·2 answers
  • So far, Carmella has collected 14 boxes of baseball cards. There are 315 cards in each box. Carmella estimates that she has abou
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!