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
Bogdan [553]
3 years ago
6

Why is -a² is always negative (a ≠ 0) and why is (-a)² is always positive?

Mathematics
1 answer:
hjlf3 years ago
6 0
-a^2=(-1)\cdot a\cdot a

Regardless of the sign of a, we have a\cdot a=a^2\ge0 (never negative). But multiplying by -1 makes it negative.

On the other hand,

(-a)^2=((-1)\cdot a)^2=(-1)^2\cdot a^2=1\cdot a^2=a^2

which can never be negative for real a.
You might be interested in
PLEASE HELP WILL GIVE BRAINLIEST TO CORRECT ANSWER
dem82 [27]

Ok so logically it would be the blue which is consistently low and unlike the others doesn't get any spikes of interst so BLUE.

8 0
3 years ago
Read 2 more answers
3^b=17 exponentials into log form
IRINA_888 [86]
Solve for the real domain

3^b = 17

if  f(x) = g(x) , then ln (f(x)) =  ln (g(x))

ln ( 3^b) = ln (17)

log _{a} (x^b) = b*log _{a} (x)

ln(3^b) = bln(3)

bln(3) = ln (17)

Solve  bln(3) = ln (17)

b =  \frac{ln(17)}{ln(3)}

hope this helps !.
5 0
3 years ago
The back of Alisha’s property is a creek. Alisha would like to enclose a rectangular area, using the creek as one side and fenci
Tanya [424]
If two of the sides are 80 feet each and the other two sides are 10 feet each, then the area would be 800 feet.
7 0
3 years ago
one number is three more than a second number. three times the first number is less than four times the second number. find the
frosja888 [35]
The first number: 3 + x
The second number: x

3 * (3 + x) < 4 * x
If you would like to find the two numbers, you can calculate this using the following steps:
3 * 3 + 3 * x < 4 * x
9 < 4 * x - 3 * x
9 < x
x > 9

Result: The first number is greater than 12 and the second number is greater than 9.
4 0
3 years ago
Please look at picture for question.
Elis [28]

Answer:

The answer is D ane B

Step-by-step explanation:

The expression (8z-4)(-7) you would have to distribute -7 to get -56z+28

The same goes for 40 in the expression (-1.4z+0.7)*40

8 0
2 years ago
Other questions:
  • Each answer choice below represents a relation by a set of ordered pairs. In which of the answer choices is the relation a funct
    12·1 answer
  • The function for the weight gain of chicks can be estimated with w(d)=45+6d where d is the number of days after hatching. In how
    8·1 answer
  • A bank loaned out $19,000, part of it at the rate of 6% per year and the rest
    5·1 answer
  • 70 mm equals how many cm
    7·1 answer
  • What am I doing wrong in step 5?
    11·1 answer
  • How can you determine if a relation is a function?
    12·1 answer
  • Calculate the distance between the points -11 and 4 on a number<br> line.
    5·1 answer
  • Please help its math
    13·1 answer
  • Help pleaseeeeeeeeeeeeee!!!!!!!!!!!!!!!! T^T
    10·2 answers
  • What is the length of the missing leg? If necessary, round to the nearest tenth.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!