Help pls pls pls

Question

There is an error made with each of the questions, explain where the mistake is made, then correct the mistake showing the correct answer for each.

1. 2x - (3y + 4) = 2x - 3y + 4
2. x(yz) = (xy)(xz)
3. a(x/y) = ax/ay
4. -3^2 = 9
5. (a+b)^2 = a^2 + b^2

Answer 1

1. - (3y + 4) = -1(3y ) - 1(4y) = - 3y - 4

2. x(yz) = xyz

3. a(x/y) = (a/1)(x/y) = ax/y

4. -3² is not (-3)², which equals 9. -3² = -(3²) = -9

5. (a + b)² = (a + b)(a + b) = a² + 2ab + b²