SOLUTION: I need help please.... Problem #6 Is this correct Directions: Evaluate if possible √-121 my answer: -11i Problem #32 Directions: Simplify by combining li

Algebra ->  Radicals -> SOLUTION: I need help please.... Problem #6 Is this correct Directions: Evaluate if possible √-121 my answer: -11i Problem #32 Directions: Simplify by combining li      Log On


   

Question 75599: I need help please....
Problem #6
Is this correct
Directions: Evaluate if possible
√-121
my answer: -11i

Problem #32
Directions: Simplify by combining like terms.
√63-2√28+5√7
this symbol "√" means radical
Problem # 48
Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers.
√(12x^3)/(5)
it reads as radical and the radicand it has a fraction 12x^3 over 5
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
#6
sqrt%28-121%29=sqrt%28121i%5E2%29+=+sqrt%28%2811i%29%5E2%29=11i

#32
sqrt%2863%29-2sqrt%2828%29%2B5sqrt%287%29
= sqrt%289%2A7%29-2sqrt%284%2A7%29%2B5sqrt%287%29
= sqrt%283%5E2%2A7%29-2sqrt%282%5E2%2A7%29%2B5sqrt%287%29
= 3sqrt%287%29-2%2A2sqrt%287%29%2B5sqrt%287%29
= 3sqrt%287%29-4sqrt%287%29%2B5sqrt%287%29
= %283-4%2B5%29sqrt%287%29
= 4sqrt%287%29

#48
sqrt%2812x%5E3%2F5%29
= %2812x%5E3%2F5%29%5E%281%2F2%29
= %284%2A3x%5E3%2F5%29%5E%281%2F2%29
= 2%283x%5E3%2F5%29%5E%281%2F2%29
= 2sqrt%283%2F5%29x%5E%283%2F2%29