Question

Simplify the expressions

Answer 1

3. C

4. A

Explanation:

3. Distribute and simplify:

`√(21)√(3) + √(21) √(14)`

=
`3 √(7) + 7 √(6)`

4. Multiply by the conjugate:

`4(√(10) +√(6) ) / (√(10) -√(6)) (√(10) +√(6))`

Simplify and divide:

`4(√(10) +√(6)) / 4`

=
`√(10) +√(6)`