Question

Which equation are correct select each other answers​

Answer 1

second and fourth are correct

Explanation:

remembering the rule of exponents

•
`a^(m)` ×
`a^(n)` =
`a^((m +n))`

then

- 7x²(4x³ + 2) = - 28
`x^(5)` - 14x² ≠ - 28
`x^(6)` - 14x²

- 2b³(6b² + 5) = - 12
`b^(5)` - 10b³ ← correct

- 3
`y^(4)` (5y² + 2) = - 15
`y^(6)` - 3
`y^(4)` ≠ - 15
`y^(8)` - 6
`y^(4)`

- 5d³ (3d² + 4) = - 15
`d^(5)` - 20d³ ← correct