akar 21, akar 28 dan akar 264 brp ya? makasi sblmnya

√21 = √3×7
√28 = √4×7
      = 2√7
√264 = √4×66
         = 2√66

Semoga membantu :)

[tex] \sqrt{21} = \sqrt{3 . 7} = \sqrt{3} . \sqrt{7} \\ \sqrt{28} = \sqrt{4 . 7} = 2 \sqrt{7} \\ \sqrt{264} = \sqrt{4 . 66} = 2 \sqrt{66} [/tex]

Semoga membantu