Question

If a=1 b =-2 c =-1 . Show that 7a +b +c =2 abc
plz write in copy this question is for class 6​

Answer 1

Answer:

7a+b+c=2

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

7*1+(-2)+(-1)=2

7-2-1=2

7-3=2

4=2

Answer 2

Given :–

• An equation, 7a + b + c = 2abc.
• Value of a = 1.
• Value of b = –2.
• Value of c = –1.

To Find :–

• Show that, 7a + b + c = 2abc.

Solution :–

An equation,

→ 7a + b + c = 2abc

Given that,

• a = 1
• b = –2
• c = –1

Now, substitute all the given values in equation (1),

→ $7(1) + ( - 2) + ( - 1) = 2(1)( - 2)( - 1)$

→ $7 \times 1 + ( - 2) + ( - 1) = 2 \times 1 \times (- 2) \times ( - 1)$

We know that,

• Positive × Positive = Positive.
• Negative × Negative = Positive.
• Positive × Negative = Negative.
• Negative × Positive = Negative.

So,

→ $7 - 2 - 1 = 2( 2)$

→ $7 - 3 = 2 \times 2$

→ $4 = 4$

Since, the left hand side (L.H.S.) and the right hand side (R.H.S.) are equal.

So, the values of a = 1 , b = –2 and c = –1 are correct and also 7a + b + c = 2abc is correct.

Hence Verified !