Question

Guyz pls answer this question
What should be subtracted from 3a+7b-10 to get -2a-7b+9?

Answer 1

Let x be subtracted.

A.T.Q.

( 3a + 7b - 10 ) - x = - 2a - 7b + 9

x = 3a + 7b - 10 + 2a + 7b - 9

x = 3a + 2a + 7b + 7b - 10 - 9

x = 5a + 14b - 19

Hence, 5a + 14b - 19 should be subtracted.

Answer 2

Answer:

Let the number to be subtracted be x, then,

3a + 7b - 10 - x = -2a - 7b + 9

⇒ -x = - 2a - 7b + 9 - (3a + 7b - 10)

⇒ -x = - 2a - 7b + 9 - 3a - 7b + 10

⇒ -x = - 2a - 3a - 7b - 7b + 9 + 10

⇒ -x = - 5a - 14b + 19

⇒ x = - (- 5a - 14b + 19)

⇒ x = 5a + 14b - 19