To find the answers, we can put the numbers as x.
A) f(x)= -2x+7, when f(3)
f(3) = -2(3)+7
=-6+7
=1
Therefore f(3) = 1
B) f(x)= -2x+7, when f(-5)
f(-5)= -2(-5)+7
=10+7
=17
Therefore f(-5) = 17
Hope it helps!
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