3 years ago

I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f

(3) B. Find x when f(x) = -21 Can somebody help me understand this ? ?

Mathematics

1 answer:

hjlf3 years ago

7 0

$f(3)=4\cdot3-5=12-5=7\\\\
4x-5=-21\\
4x=-16\\
x=-4$

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