nilai dari √18 + √800 - √72 =...

√18 + √800 - √72

= √(2 × 9 ) + √( 2 × 400 ) - √( 2 × 36 )

= 3√2 + 20√2 - 6√2

= 17√2

[tex] = \sqrt{2 \times 9} + \sqrt{2 \times 400} - \sqrt{2\times 36} \\ = 3 \sqrt{2} + 20 \sqrt{2} - 6 \sqrt{2} \\ = 17 \sqrt{2} [/tex]