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Korvikt [17]
3 years ago
5

How do you expand (5x+ 1)(5x-1)​

Mathematics
2 answers:
Eduardwww [97]3 years ago
4 0

Answer:

25x power of 2   subtract 1

Step-by-step explanation:

AnnyKZ [126]3 years ago
3 0

Step-by-step explanation:

Multiply both numbers so

25x2 - 6x + 6x - 1

25x2 - 1

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There is a triangle with a perimeter of 63 cm, one side of which is 21 cm. Also, one of the medians is perpendicular to one of t
NemiM [27]

Answer:

21cm; 28cm; 14cm

Step-by-step explanation:

There is no info in the problem/s  text which one of the triangle's  side is 21 cm. That is why we have to try all possible variants.

Let the triangle is ABC . Let the AK is the angle A bisector and BM is median.

Let O is AK and BM cross point.

Have a look to triangle ABM.  AO is the bisector and AOB=AOM=90 degrees (means that AO is as bisector as altitude)

=> triangle ABM is isosceles => AB=AM  (1)

1. Let AC=21   So AM=21/2=10.5 cm

So AB=10.5 cm as well.  So BC= P-AB-AC=63-21-10.5=31.5 cm

Such triangle doesn' t exist ( is impossible), because the triangle's inequality doesn't fulfill.  AB+AC>BC ( We have 21+10.5=31.5 => AB+AC=BC)

2. Let AB=21 So AM=21 and AC=42 .So  BC= P-AB-AC=63-21-42=0 cm- such triangle doesn't exist.

3. Finally let BC=21 cm. So AB+AC= 63-21=42 cm

We know (1) that AB=AM so AC=2*AB.  So AB+AC=AB+2*AB=3*AB

=>3*AB=42=> AB=14 cm => AC=2*14=28 cm.

Let check if this triangle exists ( if the triangle's inequality fulfills).

BC+AB>AC    21+14>28 - correct=> the triangle with the sides' length 21cm,14 cm, 28cm exists.

This variant is the only possible solution of the given problem.

6 0
3 years ago
X + 37<br> x + 67<br> 90<br> 104<br> 14<br> -14<br> -7°
natulia [17]
It would be 104? I don’t understand the question but I guessing you’re adding
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3 years ago
HELP PICTURE IS SHOWNN
Gnom [1K]
Angle TVU = 1/2 (120 - 12) = 108/2 = 56°

Therefore, the correct answer is D.
7 0
3 years ago
For the equation |ax+b|=c (where a,b, and c are real numbers and a≠0), what value of c results in exactly one solution?
Degger [83]

Step-by-step explanation:

Correct option is

D

a



=0,b



=0

The condition for ax+by+c=0 to be a linear eqaution in two variables is

a



=0,b



=0

7 0
2 years ago
I need HELP ON MY TEST 6+1 IS HELP
sergeinik [125]

Answer:

7..Bro you have to be trolling

Step-by-step explanation:

4 0
3 years ago
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