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poizon [28]
3 years ago
9

What number must be added to the expression below to complete the square? x^2-9x

Mathematics
2 answers:
Tatiana [17]3 years ago
5 0

Answer:

A.81/4

Step-by-step explanation:

To find the number that we add to complete the square, we take half of the value of b in the equation and then square it.

The value of b in this equation is -9; this makes half of it -9/2.  Squaring this,

(-9/2)² = 81/4.

pantera1 [17]3 years ago
3 0

Answer:

A.81/4

Step-by-step explanation:

x^2-9x

This is in the form x^2 + bx

To complete the square, we take b/2  then square it and add it

b =-9

b/2 = -9/2

(b/2) ^2 = (-9/2) ^2 = 81/4

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Answer:

y=3/2x+1

Step-by-step explanation:

y=mx+b is the slope-intercept form

y=3/2x+b

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2=x, 4=y

4=3/2(2)+b

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3 years ago
A small moving box has a volume of 2304 inches cubed and length of 16 inches. The box's width and height are the same. Write the
lisabon 2012 [21]

Answer:

<em>V = 16x² </em>

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<em>Height = 12in</em>

Step-by-step explanation:

Volume of the box is expressed as;

V = Length *Width * height

Given

Length = 16in

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Height = x

The volume of the box will be expressed as;

V = 16 * x * x

<em>V = 16x² (This gives the required equation)</em>

To get x:

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V = 2304in³

Substitute;

2304 = 16x²

x² = 2304/16

x² = 144

x= √144

x = 12

<em>Hence the width and the height are both 12inches since they are the same.</em>

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8 0
3 years ago
5(-6 - 12) +4.1= <br> can you help me with this question
Sophie [7]

Answer:

-85.9

Step-by-step explanation:

4 0
2 years ago
Point H(x,y) moves 12 units left and 4 units up. What is a rule that describes this translation?
Naddika [18.5K]

The x values decrease by 12 and the y increase by 4.

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5 0
3 years ago
Rewrite y = -(x + 2)2 – 5 in standard form.
xenn [34]

Answer:

y = - x² - 4x - 9

Step-by-step explanation:

Given

y = - (x + 2)² - 5 ← expand (x + 2)² using FOIL

  = - (x² + 4x + 4) - 5 ← distribute parenthesis by - 1

  = - x² - 4x - 4 - 5 ← collect like terms

   = - x² - 4x - 9 ← in standard form

8 0
3 years ago
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