Q 1) If a = 1 ,b = 4 , c = 3 Evaluate (a) 2a +b2+ c3
Answers
Answered by
1
Answer:
a+b+c=9 and a
2
+b
2
+c
2
=35
Using formula,
(a+b+c)
2
=a
2
+b
2
+c
2
+2(ab+bc+ca)
9
2
=35+2(ab+bc+ca)
2(ab+bc+ca)=81−35=46
(ab+bc+ca)=23
using formula,
(a
3
+b
3
+c
3
)−3abc=(a
2
+b
2
+c
2
−ab−bc−ca)(a+b+c)
a
3
+b
3
+c
3
−3abc=(35−23)×9=9×12=108
Answer (B) 108
Answered by
0
Answer:
2a=2, 4^2=16, c^3=27,.....2+16+27=55
Step-by-step explanation:
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