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algebra - functions & notations

by Terry
(Oroville, Wa)











































functions and notations how do you solve this
f(x) = l 3x-5 l find f(-7) + f(4)

Comments for algebra - functions & notations

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Mar 30, 2011
Algebra - Absolute Value Functions
by: Staff



The question:

by Terry
(Oroville, WA)

functions and notations how do you solve this
f(x) = l 3x-5 l find f(-7) + f(4)


The answer:

f(x) = the absolute value of 3x - 5

f(x) = | 3x - 5 |

for x = -7, substitute -7 for the x in the equation

f(x) = | 3x - 5 |

f(-7) = | 3*(-7) - 5 |

f(-7) = | -21 - 5 |

f(-7) = | -26 |

f(-7) = 26, the absolute value is always a positive value


for x = 4, substitute 4 for the x in the equation

f(x) = | 3x - 5 |

f(4) = | 3*4 - 5 |

f(4) = | 12 -5 |

f(4) = | 7 |

f(4) = 7, the absolute value is always a positive value





Thanks for writing.


Staff
www.solving-math-problems.com



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