Question

From the sum of lla+9b-7c and - 7a - 12b + 8c, subtract the sum of 6a+ 14b - 13c and 15a-b+12c.​

Answer 1

Answer: –17a –16b + 2c

Step-by-step explanation:

Sum of 11a +9b –7c and –7a –12b +8c

= 11a +9b –7c +(–7a –12b +8c)

= 11a +9b –7c –7a –12b +8c

= 4a –3b +c

Sum of 6a +14b –13c +(15a –b +12c)

= 6a +14b –13c +15a –b +12c

= 21a +13b –c

ATQ : 4a –3b +c –(21a +13b –c)

= 4a –3b +c –21a –13b +c

= –17a –16b +2c