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=(2x-1)^2 + 4(2x-1) -5
=(4x^2 -4x +1) +(8x -4) -5
=4x^2 +4x -8
(fog)(2)= 4(2)^2 +4(2) -5
= 16 + 8 -5
= 19
(2x-1)² + 4(2x-1)-5
4x²-2x+1 + 8x-4-5
4x² + 6x - 8 =
4(2)² + 6(2) - 8=
4.4 + 12- 8 = 16 + 12 - 8= 20