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= f(5)
= 2(5) - 3
= 7
f (x² + 2x -3)
2(x²+ 2x - 3) -3
2x² + 4x -6 -3
2x² + 4x -9
(fog)(2) = 2(2)² + 4(2) -9
= 2.4 + 8 - 9
= 7