Question

simplify where a=1 b=2 c=-1. 3a2+b2+c2-4ab-a2+3ab-5ac+4ab-bc
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Answer 1

Answer:

3×(1)2+(2)2+(1)2-4×1×2-(1)2+3×1×2-5×1×1+4×1×2-2×1

3+4+1-8-1+6-5+8-2

8-8-1-5-2+6+8

=6

Answer 2

Answer:

20

Step-by-step explanation:

here, a=1, b=2, c= -1

given,

3a^2 + b^2 + c^2 - 4ab - a^2 + 3ab - 5ac + 4ab - bc

= 3.(1)^2 + (2)^2 + (-1)^2 - 4.1.2 - (1)^2 + 3.1.2 - 5.1.(-1) + 4.1.2 - 2.(-1)

= 3 + 4 + 1 - 8 - 1 + 6 + 5 + 8 + 2

= 20 (Ans:)