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Brums [2.3K]
2 years ago
6

PLS HELP QUICKLY

Mathematics
1 answer:
jolli1 [7]2 years ago
3 0

Answer: B

f(x) = 7x-2 and        g(x) = \frac{x+2}{7}

How to solve:

check if the composite functions of f(x) and g(x) are equal to x (this means they are inverses)

f[g(x)] = x

g[f(x)] = x

Step-by-step explanation:

Checking A.

f(x) = \frac{5}{x} -2

g(x) = \frac{x+2}{5}

f(g(x)) = f(\frac{x+2}{5} ) = \frac{5}{\frac{x+2}{5} } -2

This does not equal x, so we know these are not inverses

Checking B.

f(x) = 7x-2

g(x) = \frac{x+2}{7}

f(g(x)) = f(\frac{x+2}{7} ) = 7(\frac{x+2}{7}) - 2 = x+2-2 = x

g(f(x)) = g(7x-2) = \frac{7x-2 + 2}{7} = \frac{7x}{7} = x

since both f(g(x)) = x and g(f(x)) = x, we can determine that they are inverses of each other.

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What is the product of -2x^3+x-5 and x^3-3x-4 ? (a) Show your work
saul85 [17]

Answer:

-3x3 - 2x - 4

Step-by-step explanation:

 ((((2•(x3))+x)-5x3)-3x)-4

 (((2x3 +  x) -  5x3) -  3x) -  4

Pulling out like terms :

4.1     Pull out like factors :

  -3x3 - 2x - 4  =   -1 • (3x3 + 2x + 4)

Polynomial Roots Calculator :

4.2    Find roots (zeroes) of :       F(x) = 3x3 + 2x + 4

Polynomial Roots Calculator is a set of methods aimed at finding values of  x  for which   F(x)=0  

Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers  x  which can be expressed as the quotient of two integers

The Rational Root Theorem states that if a polynomial zeroes for a rational number  P/Q   then  P  is a factor of the Trailing Constant and  Q  is a factor of the Leading Coefficient

In this case, the Leading Coefficient is  3  and the Trailing Constant is  4.

The factor(s) are:

of the Leading Coefficient :  1,3

of the Trailing Constant :  1 ,2 ,4

Let us test ....

  P    Q    P/Q    F(P/Q)     Divisor

     -1       1        -1.00        -1.00    

     -1       3        -0.33        3.22    

     -2       1        -2.00        -24.00    

     -2       3        -0.67        1.78    

     -4       1        -4.00        -196.00    

     -4       3        -1.33        -5.78    

     1       1        1.00        9.00    

     1       3        0.33        4.78    

     2       1        2.00        32.00    

     2       3        0.67        6.22    

     4       1        4.00        204.00    

     4       3        1.33        13.78    

Polynomial Roots Calculator found no rational roots

Final result :

 -3x3 - 2x - 4

Processing ends successfully

plz mark me as brainliest :)

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3 years ago
Read 2 more answers
Four-fifths of my current age is greater than three-quarters of my age one year from now.
klasskru [66]
Let current age be x, next we construct the inequalities for the age:
<span>Four-fifths of my current age is greater than three-quarters of my age one year from now.
</span>thus when we add 1 year to 3/4 of our current age and set the inequality
4x/5>3x/4+1......i

<span>Four-fifths of my current age is also greater than five-sixths of my age one year ago.
Thus when we subtract 1 from 5x/6 and set the inequality we get
4x/5>5x/6-1.......ii
solving the inequalities we obtain:
</span>4x/5>3x/4+1
x/20>1
hence multiplying both sides by 20 we obtain:
x>20

also

4x/5>5x/6-1
4x/5-5x/5>-1
-x/30>-1
multiplying both sides by 30 we get:
-x>-30
thus
x<30
therefore the possible values of my age will lie in the interval:
20<x<30
Thus our age is in the interval
(20,30)

8 0
3 years ago
What's the answer to this question because we haven't yet went over this in class but I'm trying to be ahead and figure out how
eimsori [14]
When two parallel lines are intersected by another straight line, the inner angles are = 180

so (20x+5) + (24x-1) = 180

solve from there
4 0
3 years ago
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