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leva [86]
2 years ago
8

11 12 13 14 15 16 17 18 19 20 time remaining 01:26:14 fiona wrote out the description of each step for her multiplication of the

binomial and trinomial (2x – 3)(5x2 – 2x + 7). In which step did fiona make an error? Step 1 step 2 step 3 step 4
Mathematics
1 answer:
Bogdan [553]2 years ago
8 0

 (2x - 3)(5x² - 2x + 7)

= 2x(5x² - 2x + 7)  -3(5x² - 2x + 7)       <em>multiplied using distributive property</em>

= 10x³ - 4x² + 14x   -15x² + 6x - 21        <em>distributed 2x and -3</em>

= 10x³ - 19x² + 20x - 21                         <em>added like terms</em>

You did not upload the image of the steps so I am not sure where fiona made the error.  Hopefully, you can figure it out from the information I provided.

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What is x?<br><br> 3x - 4 + 1 = - 2x - 5 + 5x
ehidna [41]
3x - 4 + 1 = -2x - 5 + 5x

First, simplify 3x - 4 + 1 to 3x - 3. / Your problem should look like: 3x - 3 = -3x - 5 + 5x
Second, simplify -2x - 5 + 5x to 3x - 5. / Your problem should look like: 3x - 3 = 3x - 5
Third, cancel 3x on both sides. / Your problem should look like: -3 = -5
Fourth, since -3 = -5 is false, there is no solution.

Answer: No solution

4 0
3 years ago
Read 2 more answers
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Delicious77 [7]

Answer:

a=2.5

Step-by-step explanation:

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   +2.4  +2.4

3a=7.5  Now divide by 3

/3     /3

a=2.5

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grandymaker [24]
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hope this helps!
7 0
3 years ago
Please help with #5 and #8! I don’t really know all of the info to find the volume! (Composite Figures)
bagirrra123 [75]
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Keep in mind that the area for a 3D shape is Bh, where "B" is the area of a face & "h" is the height.

#5
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First, calculate the area of a face:

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Multiply by height:

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Now you add both areas:

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I think you're doing pretty good, just don't over think things too much. Try #8 with the similar process seen here. Just comment if you get stuck.

Hope this helps!
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