3√7√21 + √48=3√7√3√7 +√3√16
√3(3√7√7 + √16)=√3(21+4)
=25√3
probe with calculator
3√7√21 + √48
= 3√7 √(7•3) + √(16 • 3)
= 3√7 • √7 √3 + √16 • √3
= 3 • 7 √3 + 4 √3
= 21 √3 + 4√3
= 25√3
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Answers & Comments
3√7√21 + √48=3√7√3√7 +√3√16
√3(3√7√7 + √16)=√3(21+4)
=25√3
probe with calculator
3√7√21 + √48
= 3√7 √(7•3) + √(16 • 3)
= 3√7 • √7 √3 + √16 • √3
= 3 • 7 √3 + 4 √3
= 21 √3 + 4√3
= 25√3