Question

3abc + 5bc - 6ac, -7abc - 9bc Subtract the given expressions.

Answer 1

3abc+5bc-6ac-(-7abc-9bc)
=>3abc+5bc-6ac+7abc+9bc
=>10abc+14bc-6ac

Answer 2

Answer:

10abc + 14bc - 6ac

Step-by-step explanation:

Given:

• First expression = 3abc + 5bc - 6ac.

• Second expression = -7abc - 9bc

On subtracting the two expressions,

$\rm (3abc + 5bc - 6ac)-(-7abc - 9bc)\\=3abc + 5bc - 6ac+7abc + 9bc\\=(3+7)abc +(5+9)bc-6ac\\=10abc + 14bc-6ac.$

Only those coefficients are added or subtracted together whose variables are same, for example, in the above operation, 3abc is subtracted with -7abc only and 5bc is subtracted only with -9bc.