Simplify :
2xy (x – 4) + 5y and find its value for
(1) x = 2, y = -1 (ii) x=1/4, y=-1/2
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Answer:
Step-by-step explanation:
2xy (x – 4) + 5y
1) - x = 2, y = -1 then
2 X 2 X ( -1 ) ( 2 - 4 ) + 5 X ( -1 )
- 4 ( 2 - 4 ) - 5
- 8 + 16 - 5
-13 + 16
3
2) - x = 1/4, y = - 1/2 then
2 X 1/4 X ( -1/2 ) ( 1/4 + 1/2 ) + 5 X ( -1/2 )
- 2/ 8 ( 1/4 + 2/4 ) - 5/2
-2/8 x 1/4 - 2/8 x 2/4 - 5/2
- 1/ 16 - 1/8 - 5/2
- 1/ 16 - 2/16 - 40/16
( -1 - 2 - 40 ) / 16
- 43 / 16
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