The simplified form of the given expression 
is 
.
<h3>How to simplify a fractional expression?</h3>
The steps to simplify a fractional expression are:
- Factorize the expressions both in the numerator and the denominator using different methods
- Remove the common terms in the numerator and denominator
- Thus, the simplified expression will be obtained.
<h3>Calculation:</h3>
The given expression is
Factorizing the numerator:
x² - 4x - 21 = x² - 7x + 3x - 21
= x(x - 7) + 3(x - 7)
= (x - 7)(x + 3)
Then,
= 
common factor (x + 3) is canceled out from both the numerator and the denominator
So,
=
Therefore, the simplified expression is .
Learn more about simplifying an expression here:
brainly.com/question/13742517
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Answer:
a = 3 , b = 5
Step-by-step explanation:
Answer:
Step-by-step explanation:
I don’t know, why are you asking me?
From my calculations, I have g = -10
Answer for the first box = -31.67
Answer for the second box = 17.22
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Work Shown:
Plug in F = -25 and solve for C
F = (9/5)C+32
-25 = (9/5)C + 32
(9/5)C + 32 = -25
(9/5)C = -25-32 ... subtract 32 from both sides
(9/5)C = -57
C = (5/9)*(-57) ... multiply both sides by 5/9, its the reciprocal of 9/5
C = -31.667 approximately
C = -31.67 rounding to 2 decimal places
This shows that -25 degrees F converts to roughly -31.67 degrees C.
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Repeat the same basic steps, but now use F = 63
F = (9/5)C+32
63 = (9/5)C+32
(9/5)C+32 = 63
(9/5)C = 63-32
(9/5)C = 31
C = (5/9)(31)
C = 17.222 approximate
C = 17.22
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If the temperature ranges from -25 degrees F to 63 degrees F, then this converts to the range of roughly -31.67 degrees C to 17.22 degrees C
