Question

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Answer 1

$(3 \sqrt{12}) \times( 7 \sqrt{15} )$

$\implies 21 \sqrt{180}$

$\implies 21 \sqrt{9 \times4 \times5}$

$\implies 21 \times 6 \sqrt{5}$

$\therefore 126 \sqrt{5}\:\:(or)\:\:281.74$

Answer 2

*Question*- 3√12 ×7√15

Solution:-

⟹ 3√12× 7√15

⟹ 3×7×√12×15

⟹ 21×√4×3×3×5

⟹ 21×√2×2×3×3×5

⟹ 21×√(2×2)×(3×3)×5

⟹ 21×2×3×√5

⟹ 126√5

Therefore;

Simplest form of 3√12 ×√15

=126√5

And finally Answer is 126√5