√(45) = √(3*3*5) = 3√(5)
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3 radical 5
You probably mean what is the simplest form of sqrt 45....? 45=3x3x5 3x3 is a square number, so sqrt45=sqrt(9*5)=sqrt(9)*sqrt(5)=3*sqrt(5) * indicates multiplication sqrt indicates a square root (also known as a surd (in the english national curriculum) or a radical...apparently
sqrt(3) x sqrt(15) = sqrt( 3 x 15 ) = sqrt( 45 ) = sqrt( 9 x 5 ) = 3 sqrt(5)
There is no reasonable radical approximation for radical 11.
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