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Combining Functions Review

Authored by Amy Mueller

Mathematics

10th - 12th Grade

CCSS covered

Used 42+ times

Combining Functions Review
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8 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Perform (h - g)(n) given the two functions 

 h(n)=4n1h\left(n\right)=4n-1  and  g(n)=n2+3g\left(n\right)=n^2+3  

 n2+4n+4n^2+4n+4  

 3n34n13n^3-4n-1  

 n2+4n4-n^2+4n-4  

 n24n+4n^2-4n+4  

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Perform (g - f)(x) given  g(x)=2x1g\left(x\right)=-2x-1  and  f(x)=3x+4f\left(x\right)=3x+4  

 5x+55x+5  

 5x5-5x-5  

 x2+2x4-x^2+2x-4  

 5x+5-5x+5  

Tags

CCSS.HSF-BF.A.1B

3.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Perform \left(h\cdot g\right)\left(x\right)  given  h(x)=2x5h\left(x\right)=2x-5  and  g(x)=x24g\left(x\right)=x^2-4  

 2x35x28x+202x^3-5x^2-8x+20  

 2x33x2+9x-2x^3-3x^2+9x  

 4x2+8x-4x^2+8x  

 2x35x2+8x+20-2x^3-5x^2+8x+20  

Tags

CCSS.HSF-BF.A.1B

4.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Perform  \left(\frac{g}{f}\right)\left(x\right)  given  g(x)=x21g\left(x\right)=x^2-1  and  f(x)=4x+4f\left(x\right)=4x+4  . *HINT: Factor both to see if you can cancel anything!*

 4x1\frac{4}{x-1}  

 x14\frac{x-1}{4}  

 2x12x\frac{2x-1}{2x}  

 4x+1-\frac{4}{x+1}  

5.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Perform  \left(g+f\right)\left(x\right)  given  f(x)=4x4f\left(x\right)=4x-4  and  g(x)=3x3g\left(x\right)=3x-3  . Then identify the domain of the combination. 

 5x4; Domain: (,)-5x-4;\ Domain:\ \left(-\infty,\infty\right) 

 5x1; Domain: [0,)-5x-1;\ Domain:\ \left[0,\infty\right)  

 5x1; Domain: (,)5x-1;\ Domain:\ \left(-\infty,\infty\right)  

 4x+1; Domain: (,1)-4x+1;\ Domain:\ \left(-\infty,1\right)  

6.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Perform  (fg)(t)\left(f\cdot g\right)\left(t\right)  given  f(t)=4t+3f\left(t\right)=4t+3  and  g(t)=t2+5tg\left(t\right)=t^2+5t  . Then identify the domain of the combination. 

 3t3+10t2+8t; Domain: [0,)3t^3+10t^2+8t;\ Domain:\ \left[0,\infty\right) 

 4t3+23t215t; Domain: (,)-4t^3+23t^2-15t;\ Domain:\ \left(-\infty,\infty\right)  

 2t49t3+9t2; Domain: (,0]2t^4-9t^3+9t^2;\ Domain:\ \left(-\infty,0\right]  

 4t3+23t2+15t; Domain: (,)4t^3+23t^2+15t;\ Domain:\ \left(-\infty,\infty\right)  

7.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Perform  (fg)(x)\left(\frac{f}{g}\right)\left(x\right)  given  f(x)=3x3+3xf\left(x\right)=3x^3+3x  and  g(x)=2x2g\left(x\right)=2x-2  . Then identify the domain of the combination. 

 x242x+5; Domain: (,52)U(52,)\frac{x^2-4}{-2x+5};\ Domain:\ \left(-\infty,\frac{5}{2}\right)U\left(\frac{5}{2},\infty\right) 

 2x23x33x; Domain: (,0)U(0,)\frac{-2x-2}{-3x^3-3x};\ Domain:\ \left(-\infty,0\right)U\left(0,\infty\right)  

 2x23x3+3x; Domain: (,3)U(3,)\frac{2x-2}{3x^3+3x};\ Domain:\ \left(-\infty,-3\right)U\left(-3,\infty\right)  

 3x2+3x2x2; Domain: (,1)U(1,)\frac{3x^2+3x}{2x-2};\ Domain:\ \left(-\infty,1\right)U\left(1,\infty\right)  

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