Question

Simplify the expression and find its value when a = 2 and b = 1/2

The expression is: (3a + 4b - 6) – (2a - 4b + 7)​

Answer 1

Answer:

-7

Step-by-step explanation:

(3*2+4*1/2)-(2*2-4*1/2+7). 2-4+2-7. -7

Answer 2

Answer:

-7

Step-by-step explanation:

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

There are two methods to solve it

Method 1. Put the given value directly

(3×2+4+1/2-6)-(2×2-4×1/2+7)

(6+2-6)-(4-2+7)

2-9= -7 Ans.

Method 2. Solve the given equation

3a+4b-6-2a+4b-7 (sign changes when -ve is multiplied)

= a+8b-13

putting value of a and b

= 2+8×1/2-13

= 6-13= -7 Ans