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f = 4x - 2
g = 2(x² - 3) = 2x² - 6
f(g(x)) = 4(2x² -6) - 2
= 8x² -24 - 2
= 8x² - 26
f(g(-2)) = 8(-2)² - 26
= 8(4) - 26
= 32 - 26 = 6
g(f(x)) = 2(4x - 2)² - 6
= 2(16x² - 16x + 4) - 6
= 32x² - 32x + 8 - 6
= 32x² - 32x + 2
g(f(-3)) = 32(-3)² -32(-3) + 2
= 32(9) -32(-3) + 2
= 288 + 96 + 2 = 386