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3 years ago

Someone please help me with this

Mathematics

1 answer:

WINSTONCH [101]3 years ago

6 0

Answer:

<h2>download the app PHOTOMATH and right your solution</h2>

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A theater has 1200 seats. each row has 20 seats. write and solve an equation to find the number xx of rows in the theater. an eq

hammer [34]

The equation is 20x = 1200
x=1200÷20
x=60 rows

5 0

3 years ago

Solve x2 - 8x - 9 = 0. Rewrite the equation so that it is of the form x2 + bx = c.

barxatty [35]

Answer:

x=9,-1 and $x^2+(-8)x=9$

Explanation:

we have been given with the quadratic equation $x^2-8x-9$

we compare the given quadratic equation with general quadratic equation

general quadratic is $ax^2+bx+c=0$

from given quadratic equation a=1,b= -8,c= -9

substituting these values in the formula for discriminant $D=b^{2}-4ac$

$D=(-8)^2-4(1)(-9)=100$

Now, to find the value of x

Formula is $x=\frac{-b\pm\sqrt{D}}{2a}$

Now, substituting the values we will get

$x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1$

And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of

$x^2+bx=c$

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Zanzabum

Ask the way on the top, (8-6) is not 2, it’s 4

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Which equation describes a parabola that opens left or right and whose vertex is at the point (h, v)?

nalin [4]

Vertex is at the point ( h , v )
The equation of a parabola is:
x = a ( y - v )² + h
Answer: B )

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shutvik [7]

Answer:

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18 is 3 times as much as 6 - true

9 is 3 times as much as 27- false

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3 years ago