X2 + 2y by x - 2xy +y3 and find the value of the oroduct for x=1 and y=-1
Answers
Answered by
1
Answer:
Identity used: x
3
+y
3
+z
3
−3xyz=(x+y+z)(x
2
+y
2
+z
2
−xy−yz−zx)
Now,(x+2y+3z)(x
2
+4y
2
+9z
2
−2xy−6yz−3zx)
=(x+2y+3z)(x
2
+(2y)
2
+(3z)
2
−x×2y−2y×3z−3z×x)
=x
3
+(2y)
3
+(3z)
2
−3×x×2y×3z
=x
3
+8y
3
+27z
3
−18xyz
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Answered by
0
Answer:
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