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liubo4ka [24]
3 years ago
7

S squared - 16s - 57

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
7 0
S² - 16s - 57 = s² - 16s + 64 - 121 = s² - 2*1*8 + 8² - (11)² =
<span>we use the formula  a</span>² - 2ab + b² = (a-b)²
(s - 8)² - (11)²
<span>we use the formula a</span>² - b² = (a+b)*(a-b)
(s - 8 )² - (11)²
   a²      -   b²
 
[ (S - 8) - 11] * [ (S-8) + 11] = [S-19] * [S+3]                     
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Simplify 2(a+5)−3(5a−4)
Nutka1998 [239]

Answer:

-13a+22

Step-by-step explanation:

we have

2(a+5)-3(5a-4)

step 1

Apply the distributive property  both terms

2a+2(5)-3(5a)+3(4)

2a+10-15a+12

step 2

Combine like terms

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2 years ago
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2 years ago
Select the property that is demonstrated by: 3 + 7 = 7 + 3 Group of answer choices Identity Property Associative Property Commut
cricket20 [7]

Answer:

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Step-by-step explanation:

8 0
3 years ago
How to subtract a negative fraction from a positive fraction?
ikadub [295]
Let's take an example to illustrate this case:

<span>positive fraction = 2/7
</span>
<span>negative fraction = - 3/5

Now we need to subtract  </span><span>- 3/5 from 2/7

Right?

2/7 - (-3/5) = 2/7 + 3/5

here we need to unify the denominators as follows:

the lowest common factor between 7 and 5 is 35
2/7 = 10/35
3/5 = 21/35

Now back to </span><span>2/7 + 3/5:

</span><span><span>2/7 + 3/5 = 10/35 + 21/35 = (10+21)/35 = 31/35

That's it




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8 0
3 years ago
Find the sum: <br>20°15' 18" <br>30° 41' 32" <br>+2 30' 15"<br>________​
inna [77]

Answer:

52° 86' 65"

Step-by-step explanation:

20° + 30° + 2° = 52°

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18" + 32" + 15" = 65"

8 0
3 years ago
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