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3 years ago

Solve for x in the equation x 2 - 4 x - 9 = 29.

Mathematics

2 answers:

Aliun [14]3 years ago

8 0

Answer:

$x=2-\sqrt{42}$ and $x=2+\sqrt{42} \\$

Step-by-step explanation:

Solve using the quadratic formula, which is $x=\frac{-b + \sqrt{b^{2}-4ac }}{2a}$ and $x=\frac{-b-\sqrt{b^{2}-4ac } }{2a}$

Marizza181 [45]3 years ago

5 0

Answer:

x= -19

Step-by-step explanation:

2x-4x-9=29

-2x=29+9

x=38/-2

= -19

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How many solutions does it have? 3x+4 = 3x+4

MrRa [10]

Answer:

it has no solution.......

answer will be 3x+4 = 3x+4 i.e, 0=0 ,so

but if 3x+4 = 0 , x= -4/3 . Its a linear equation and has only one solution

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2 years ago

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The two lines y=2/5x+9 and y= -2/5x-9 are: a) parallel b) perpendicular c)neither

irakobra [83]

Answer:

neither

Step-by-step explanation:

parallel lines have the same slope and different y-intercept

perpendicular lines have the reciprocal as slopes( 2/5 and 5/2)

as these slopes have neither the answer in NEITHER

8 0

3 years ago

Xanthia can read 100 pages per hour and Molly can read 50 pages per hour. If they each read the same book, and the book has 225

Talja [164]

Answer:

135 minutes

Step-by-step explanation:

Let

y -----> the number of pages to finish reading the book

x ----> the number of hours

we know that

The linear equation in slope intercept form is equal to

$y=mx+b$

where

m is the unit rate or slope of the linear equation

b is the y-intercept or initial value

In this problem we have

Xanthia

$m=100\ pages/hour$

$b=225\ pages$

$y=-100x+225$ ----> the slope is negative because is a decreasing function

For y=0

substitute and solve for x

$0=-100x+225$

$100x=225$

$x=2.25\ hours$ ---> Xanthia's time to finish reading the book

Molly

$m=50\ pages/hour$

$b=225\ pages$

$y=-50x+225$ ----> the slope is negative because is a decreasing function

For y=0

$0=-50x+225$

$50x=225$

$x=4.5\ hours$ --- Molly's time to finish reading the book

To find out how many more minutes than Xanthia would it take for Molly to finish reading the book, subtract Xanthia's time from Molly's time

$4.5\ h-2.25\ h=2.25\ h$

Convert to minutes

Multiply by 60

$2.25\ h=2.25(60)=135\ minutes$

4 0

3 years ago

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The diagonals of kite KITE intersect at point P. If m A. 34° B. 46° C. 68° D. 92°

JulijaS [17]

Answer:

The diagonal of kite intersect at the point p is C. 68°

7 0

3 years ago

Could you please provide the answer as well as explain it, I will be very grateful...

Vilka [71]

Hello,

There is a mistake: it is 816 cm² !!! (an area)

length are multiplied by 2,
so area are mutiplied by 2²=4
Area B=816*4=3264 (cm²)

7 0

3 years ago