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3 years ago

(a-1)*(a+1) How does the expansion of this thing works?

1 answer:

5 0

This is a simple formula:(a-b)*(a+b)= a^2-b^2
And it goes like this for your example: (a-1)*(a+1)=a*a+a-a-1*1=a^2-1^2=a^2-1

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Please help me :(((((

irga5000 [103]

Answer:

,hbdgyhy6jyiwci7oygiuhopuoyiudysrtaehsyrdutfihipj

Step-by-step explanation:

yugd oufygp8iuhyefyif hovujm

5 0

3 years ago

Alex is setting up an in-line skating course 21 feet long to practice weaving around cones. He wants a cone every 3 1/2 feet. Ho

Sauron [17]

Answer:

I think it is 6 cones

Step-by-step explanation:

21 ÷ 3.5 = 6

3 0

3 years ago

Which of the following is described by the notation? <-> AB|| <-> CD? A. Skew lines b. Parallel lines c. Intersectin

timofeeve [1]

Answer:

I think B or C

Step-by-step explanation:

6 0

4 years ago

7.find the equation of a circle with one of the diameters x+2y+8=0and passing through the intersection of a circle x²+y²+2=0 and

ozzi

Answer:

See below

Step-by-step explanation:

Find the intersection of circles

x² + y² + 2x = 0 and
x² + y² - 3y = 0

Subtract the equations to find:

2x = -3y ⇒ y = -2/3x

By substitution find the points:

(0, 0) and (-1.385, 0.923)

Find midpoint between these two points:

x = (0- 1.385)/2 = -0.6925 , y = (0 + 0.923)/2 = 0.4615

Find perpendicular bisector passing through this point:

y - 0.4615 = 3/2(x + 0.6925)
y = 1.5x + 0.4615 + 1.5(0.6925)
y = 1.5x + 1.50025

Find intersection of the lines, it is the center:

y = 1.5x + 1.50025
x + 2y + 8 = 0

Solving we get:

x = -2,75, y = -2.625

Find radius, the distance from center to point (0, 0) and get equation of circle:

(x + 2.75)² + (y + 2.625)² = (0 + 2.75)² + (0 + 2.625)²
x² + 5.5x + y² + 5.25y = 0
4x² + 22x + y² + 21y = 0
4x² + 4y² + 22x + 21y = 0

4 0

3 years ago

Read 2 more answers

What is the area of this triangle

Sergeu [11.5K]

6 squared units

Hope this helps!

oh and here is the formula and substatution..
A=(b*h)/2
A=(6*2)/2

4 0

3 years ago