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Leya [2.2K]
2 years ago
8

Factor b^4 - 2b^2 - 63

Mathematics
2 answers:
11111nata11111 [884]2 years ago
5 0
The answer
(b-9) and (b+7)
Andrej [43]2 years ago
4 0

Answer:

( b − 9 ) ( b + 7 )

Step-by-step explanation:

Find two number that multiplies - 63 and add - 2

9 & 7 are both the greatest common factor

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Solve the system of equations by transforming a matrix representing the system of equation into reduced row echelon form.
Gekata [30.6K]

Take the augmented matrix,

\left[\begin{array}{ccc|c}2&1&-3&-20\\1&2&1&-3\\1&-1&5&19\end{array}\right]

Swap the row 1 and row 2:

\left[\begin{array}{ccc|c}1&2&1&-3\\2&1&-3&-20\\1&-1&5&19\end{array}\right]

Add -2(row 1) to row 2, and -1(row 1) to row 3:

\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&-3&4&22\end{array}\right]

Add -1(row 2) to row 3:

\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&0&9&36\end{array}\right]

Multiply through row 3 by 1/9:

\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&-5&-14\\0&0&1&4\end{array}\right]

Add 5(row 3) to row 2:

\left[\begin{array}{ccc|c}1&2&1&-3\\0&-3&0&6\\0&0&1&4\end{array}\right]

Multiply through row 2 by -1/3:

\left[\begin{array}{ccc|c}1&2&1&-3\\0&1&0&-2\\0&0&1&4\end{array}\right]

Add -2(row 2) and -1(row 3) to row 1:

\left[\begin{array}{ccc|c}1&0&0&-3\\0&1&0&-2\\0&0&1&4\end{array}\right]

So we have \boxed{x=-3,y=-2,z=4}.

3 0
3 years ago
Plz help me, no one has. I'll give 100 brainly pts
Serhud [2]

Answer:

to find the distance between two points, in order to find the length of the triangle we need first to find the instance between the two points

distance between (2,9) and (2,4) .....a =5

distance between (2,4) and (6,4) .....b = 4

when we find the length of the side of the triangle , then we can apply the Pythagorean theorem to find hyp. c

a²+b²=c²

6 0
2 years ago
PLEASE HELP ME!!!!!!!
Gennadij [26K]
-4x < 20
Divide -4 on both sides and the x would be by itself and 20/4 = 5. Since it is a negative, the sign would switch to >
This would be the inequality : x > 5

Numbers in the solution set would be any number greater than 5
ex: 6, 10, 15
5 0
2 years ago
A bus takes 45 minutes to travel 48 kilometres. What is its average<br>speed?<br>​
navik [9.2K]

Answer:

64km/h

Step-by-step explanation:

Average speed= 48km÷45 minutes

= 48km÷0.75h

= 64km/h

6 0
2 years ago
Please answer today! Ill give brainlest
inysia [295]

Answer:

16 meters

Step-by-step explanation:

pls give the brainiest

8 0
2 years ago
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