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postnew [5]
3 years ago
6

How to factor x^2-49y^2

Mathematics
2 answers:
marishachu [46]3 years ago
8 0
x^2-49y^2=x^2-(7y)^2=(x-7y)(x+7y)\\\\\\a^2-b^2=(a-b)(a+b)
Zigmanuir [339]3 years ago
3 0
X^2-49y^2 = (x-7y)(x+7y)
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What is the solution to the system of linear equations?<br> 2x+4y=38<br> 10x+3y=105
tamaranim1 [39]
Hello :
<span>2x+4y=38  ...(1)
10x+3y=105....(2)
-10x-20y = - 190
10x+3y =105 
add : -17y = - 85
y = 5
subsct in (1) : 2x +20  =38
2x = 18
x=9

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6 0
2 years ago
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PLS HELP<br> Find an equation of the line with a y-intercept of -3 and an x-intercept of -4.5
kari74 [83]

Answer:

y = - \frac{2}{3} x - 3

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = \frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }

with (x₁, y₁ ) = (0, - 3) and (x₂, y₂ ) = (- 4.5, 0 ) ← coordinates of intercepts

m = \frac{0-(-3)}{-4.5-0} = \frac{0+3}{-4.5-0} = \frac{3}{-4.5} = - \frac{2}{3}

The line crosses the y- axis at (0, - 3 ) ⇒ c = - 3

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2 years ago
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Joel is constructing a line perpendicular . He has already constructed three arcs as shown. Use the image to answer the question
IgorC [24]
<span>It must be the same as it was when constructing the arc above P.</span>
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3 years ago
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Find the area of this trapezoid. Include the correct unit in your answer.
NemiM [27]

Answer:

\displaystyle A _{ \text{trapezoid}} =  70 {m}^{2}

Step-by-step explanation:

we are given a trapezoid

we want to figure out the area

remember that,

\displaystyle A _{ \text{trapezoid}} =  \frac{a + b}{2} h

where a and b represent the parallel lines and h represents the height

we get from the pic that a and b are 5 and 15 respectively and h is 7

so substitute:

\displaystyle A _{ \text{trapezoid}} =  \frac{5 + 15}{2} \times  7

simplify addition:

\displaystyle A _{ \text{trapezoid}} =  \frac{20}{2} \times  7

simplify division:

\displaystyle A _{ \text{trapezoid}} =  10\times  7

simplify multiplication:

\displaystyle A _{ \text{trapezoid}} =  70

since we multiply two same units we of course have to use square unit

hence,

\displaystyle A _{ \text{trapezoid}} =  70 {m}^{2}

4 0
2 years ago
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