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Im confused can somebody help me please

Im confused can somebody help me please-example-1
User Kfirba
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well, we know the piece-wise function is
f(x)= \begin{cases} 7x+10&amp;x < 0\\\\ 7x+20&amp;x\geqslant 0 \end{cases}

hmmm so what's f(-1), namely what is f(x) when x = -1?

well, when x = -1, hmm -1 is less than 0, so the subfunction that applies to that will be when "x" is less than 0, namely the part of 7x + 10, so we can say

f(-1) = 7(-1) + 10

f(-1) = 3

so hmm what's f(0) or namely, what's f(x) when x = 0?

well, what subfunction applies when x = 0? well, it has to be the subfunction with "x greater or equals to 0", x ⩾ 0, so then is 7x + 20

f(0) = 7(0) + 20

f(0) = 20.

User MikeTV
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