You have the following expression:
2(a + 1) - 4(9 - a)
In order to simplify the previous expression, proceed as follow:
- Expand the factors:
2(a) + 2(1) - 4(9) - 4(-a)
- Consider the law for the product of sign:
2a + 2 - 36 + 4a
- Simplify like terms (constant terms and terms with variable a):
2a + 4a + 2 - 36 = 6a - 34
Hence, the simplified expression is 6a - 34