Question

Add 6a + 8b-7c , 2b + c - 4a and a - 3b - 2c​

Answer 1

Answer:

3a + 7b - 8c

Step-by-step explanation:

I am using the horizontal method for this. you can use the vertical method too.

We take the like terms in bracket.

(6a - 4a + a) + (8b + 2b - 3b) + (-7c + c - 2c)

which becomes

3a + 7b - 8c

Answer 2

Given,

$6a+8b-7c---- > (1)\\2b+c-4a------ > (2)\\a-3b-2c------- > (3)$

adding $(1)+(2)+(3)$ we get

$=(6a+8b-7c)+(2b+c-4a)+(a-3b-2c) \\= (6a-4a+a)+(8b+2b-3b)+(-7c+c-2c)\\= 3a+7b-8c$

∴By adding $(1),(2),(3)$ we get $3a+7b-8c$

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