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4 years ago

Which is a solution to (x – 3)(x + 9) = –27? x = –9 x = –3 x = 0 x = 6

2 answers:

8 0

Expand
x²+6x-27=-27
add 27 both sides
x²+6x=0
factor
x(x+6)=0
set to zero

x=0

x+6=0
x=-6

x=0 or -6

answer is 0 since -6 is not listed

Stels [109]4 years ago

5 0

First you would multiply x by x so x^2. next x*9 would be 9x then -3*x would be -3x last you would do -3*9 would be -27 then you would simplify that out

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defon

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3 years ago

SECTION 1-1 PRACTICE

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Answer:

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Step-by-step explanation:

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3 years ago

So I know that |-5| =5 but what does this -|-5| equal? and explain why

valentina_108 [34]

Absolute value
means whatever is inside is positive, once we resolve the inside, work out

|-5|=5

now -5=?=-5

answer is -5 since - of + is negaitve
if you don't get it still think like this

|-5|=5
mulitp;ly by -1 everybody
-|-5|=-5

7 0

3 years ago

a 12 foot tall building casts on 8 foot long long shadow. how long of a shadow will a 5 foot tall women have

grin007 [14]

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4 years ago

Can someone help me with the questions in the picture?

Tpy6a [65]

Answer:

9. Perpendicular

10. neither

11. Perpendicular

12. neither

Step-by-step explanation:

------------------

Slope Intercept Form: y = mx + b

* M is the slope

* B is the y intercept

------------------

Lines are parallel if they have the same slope (ex. If two equations have a slope of 2)

Lines are perpendicular if they have the opposite and the reciprocal slope (ex. If 1 equation has a slope of 3 and another equation has a slope of - $\frac{1}{3}$ )

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9. Perpendicular: The slopes are reciprocal of each other and one of them is negative

10. Neither: The lines are not perpendicular because the slopes are both negative

11. Perpendicular: If you plot y=5 it is a horizontal line through 5. If you plot x=-3 it is vertical line through -3. These lines intercept and are perpendicular.

12. Neither: The slopes of both equations need to be the same to be parallel

Put both equations into y=mx+b
y = 1/2x -2 AND y = -1/2x -2

4 0

3 years ago