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f(-4)=4(16)-5(-4)
We simplify the equation to the form, which is simple to understand
f(-4)=4(16)-5(-4)
Reorder the terms in parentheses
+(-4f)=4*(16)-5*(-4)
Remove unnecessary parentheses
-4f=+4+*(+16+)-5+*(-4+)
Reorder the terms in parentheses
-4f=+(+64)-5*(-4)
Remove unnecessary parentheses
-4f=+64-5+*(-4+)
Reorder the terms in parentheses
-4f=+64+(+20)
Remove unnecessary parentheses
-4f=+64+20
We move all terms containing f to the left and all other terms to the right.
-4f=+64+20
We simplify left and right side of the equation.
-4f=+84
We divide both sides of the equation by -4 to get f.
f=-21
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