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lions [1.4K]
3 years ago
15

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

Mathematics
1 answer:
maxonik [38]3 years ago
4 0

ANSWER

2 \frac{1}{4}

EXPLANATION

We want to find the constant that must be added to

{x}^{2}  - 3x

to form a perfect square.

Comparing the given expression to

a{x}^{2}  + bx + c

we have

a=1 , b=-3 , and c=0.

We need to add

{( \frac{b}{2a} })^{2}

We substitute the values to get,

{( \frac{ - 3}{2(1)} })^{2}  =  \frac{9}{4}

We change this to mix numbers to get,

2 \frac{1}{4}

The last choice is correct.

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Can someone help????
Sonja [21]

Answer:

14 blocks

Step-by-step explanation:

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2 years ago
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Maria makes a fruit salad. The table shows the amounts of different kinds of fruit that she uses.
Elena-2011 [213]
Your answer is 3 1/4
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PLEASE HELP!!
beks73 [17]
<span>Let x = the width
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It says,"The length of a rectangle is 4 less than 3 times the width." write that as:
L = 3x - 4
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If the perimeter is 40, find the dimensions of the rectangle.
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We know: 2L + 2W = 40
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Substitute (3x-4) for L and x for W
2(3x-4) + 2x = 40
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6x - 8 + 2x = 40; Multiplied what's inside the brackets
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6x + 2x = 40 + 8; do some basic algebra to find x; (added 8 to both sides)

:
8x = 48
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x = 48/8
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x = 6 which is the width
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It said that L = 3x - 4, therefore:
L = 3(6) - 4
L = 18 - 4
L = 14; is the length
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Check our solutions in the perimeter:
2(14) + 2(6) =
28 + 12 = 40</span>
8 0
2 years ago
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PLEASE HELP! ASAP! I WILL GIVE BRAINLIEST<br> What is 365x853. Can you help me? Thank you!
Pavel [41]

311,345

Hope this helps!

4 0
2 years ago
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I got this far in my working out and am already stuck. have i gone wrong?
Kipish [7]

Yes, you made an algebraic error. By multiplying 18 x 4, you messed up on order of operations.

(x+9)(x+2)*4

becomes:

(x^2+11x+18)*4

= 4x^2 + 44x + 72


anyway, this is how I would do this problem:

(x+9)(x+2)(4) = 912

(x+9)(x+2) = 228

x^2 + 11x + 18 = 228

x^2 + 11x - 220 = 0

(x+21)(x-10) = 0

x = -21 or 10

The dimensions can't be negative, so we only use x = 10

The dimensions are then 10+9, 10+2, 4

or 19, 12, 4

6 0
3 years ago
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