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24-01-2019
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let f (x) = 4+8 and g(x) = 2x -12

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28-01-2019

(f+x) (x) = 4x + 8+2x-12
(f+x) (x) = 6x+8+3x-12

(f-g) (x) = 4x+8-2x+12
(f-g) (x) = 2x +20

(f*g) (x) = (4x+8) (2x-12)
(f*g) (x) = 8xx - 48x + 16x-96
(f*g) (x) = 8xx-32x-96

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