Given w(x) = 3x + 8, find w(2b + 6).

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Given w(x) = 3x + 8, find w(2b + 6).

Plug the value of 2b + 6 in for x
w(2b + 6) = 3(2b + 6) + 8

Multiply through:
w(2b + 6) = 6b + 18 + 8

Group like terms:
w(2b + 6) = 6b + 26