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Step-by-step explanation:
(f + g)(x)=
f×x + g×x =
fx + gx =
fx + gx= 3x² -x + 4 + 4x² - 5x + 2
3x² + 4x² -x - 5x + 4 + 2
=7x² - 6x + 7( I can't go past here)