Question

a) știind ca x=4 determinați produsul p=(x+1) x (2x+11) x (3x-7). b) știind ca y=9 determinați produsul p=(y+5) x (2y-4) x (3y+3).

Answer 1

x = 4  

p = ( x + 1 ) ( 2 x + 11 ) ( 3 x - 7 )

p = ( 4 + 1 ) × ( 8 + 11 ) × ( 12 - 7 )  

p = 5 × 19 × 5

p = 95 × 5

p = 475 → produsul

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p = ( y + 5 ) × ( 2 y - 4 ) × ( 3 y + 3 )

p = ( 9 + 5 ) × ( 18 - 4 ) × ( 27 + 3 )

p = 14 × 14 × 30

p = 5 880