Question

Z÷3-4z+4(z-5) when z=15 help please

Answer 1

Substitution: 15 / 3 - 4(15) + 4(15-5)

The solving for some: 5 - 60 + 40

And the combining them: 45 - 60

And the answer is: -15

Answer 2

z ÷ 3 - 4z + 4(z - 5); z = 15

z ÷ 3 - 4z + 4(z - 5) =

= 15 ÷ 3 - 4(15) + 4(15 - 5)

= 5 - 60 + 4(10)

= -55 + 40

= -15

Answer: -15