factor the 18. 18=2x3x3. Take out the 3 because it is squared.
5x3 radical 2=15radical2
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15 radical 2
Quadrilateral
18 multiplied by 5 is 90.
Not necessarily. If it is the same radical number, then the signs cancel out. Radical 5 times radical 5 equals 5. But if they are different, then you multiply the numbers and leave them under the radical sign. Example: radical 5 * radical 6 = radical 30
18/5 or 3.6