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Daniel [21]
3 years ago
7

Factor completely please

Mathematics
1 answer:
Sedbober [7]3 years ago
3 0

Answer:

Step-by-step explanation:

hello :

1-x² = (1-x)(1+x) by identity : a²-b²=(a-b)(a+b)

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Evaluate 21/a+4 when a=3
DochEvi [55]

Answer:

11

Step-by-step explanation:

All you have to do is plug in a. In this case, a=3.

21/a+4

21/(3)+4

21/3+4

7+4

11

If this helps please mark as brainliest

5 0
3 years ago
Read 2 more answers
Find the perimeter of the following trapezoid:<br>6ft<br>8ft<br>2.5ft<br>2.5ft<br>2ft​
kirill [66]

Answer:

21

Step-by-step explanation:

Add all the numbers together

6+8+2.5+2.5+2=21

6 0
3 years ago
PLEASE PLEASE PLEASE HELP!!
irga5000 [103]
  9            a
------  =  -----
  a            5

a^2 = 45 

a = 3<span>√5
</span>
  4            b
------  =  -----
  b            5

b^2 = 20

b = 2√5

answer: 

a = 3√5
b = 2√5

hope it helps
7 0
3 years ago
Find the equation of the line perpendicular to the 13x-3y=9 and passing through (-5,0)
aev [14]

9514 1404 393

Answer:

  x +4y = -5

Step-by-step explanation:

The equation of the perpendicular line can be found by swapping the x- and y-coefficients and negating one of them. The new constant can be found by substituting the point values into the equation.

  3x +12y = 3(-5) +12(0)

  3x +12y = -15

We notice that all of the values include a factor of 3. We can divide that out to put the equation in standard form:

  x + 4y = -5

8 0
2 years ago
J____K_______L JK is x+3 KL is 2x-5 JL is 19 find the value of JK
charle [14.2K]
JK= 8, because x+3= 2x-5= 19
3 0
3 years ago
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