Question

3(28а+в)-73а+8в при а+в=7

Answer 1

84a+3b-73a+8b=11a+11b=11(a+b)=11*7=77

Answer 2

3 × (28 × 3 + 4) - 73 × 3 + 8 × 4 = 77

Answer 3

To simplify the expression 3(28a + b) - 73a + 8b when a + b = 7, you can substitute the value of a + b into the expression and then simplify:

Given: a + b = 7

Now, substitute this value in the expression:

3(28a + b) - 73a + 8b

= 3(28a + b) - 73a + 8b [Since a + b = 7, we can replace it]

= 3(28a + b) - 73a + 8b

Now distribute the 3:

= 84a + 3b - 73a + 8b

Combine the like terms:

= (84a - 73a) + (3b + 8b)

= 11a + 11b

Now, you know that a + b = 7, so you can replace a + b with 7:

= 11 * 7

= 77

Therefore, the simplified expression when a + b = 7 is 77.