CLASS 9 · LEARNING KNOWLEDGE
Square Roots and Real Numbers
How it works
The square root √a denotes the nonnegative number whose square is a. In the real number domain, a must satisfy a≥0. When simplifying, quadratic factors can be extracted from the root.
Note
√(a·b)=√a·√b for a,b≥0; √(x²)=|x|.
√(a·b)=√a·√b for a,b≥0; √(x²)=|x|.
An example
Calculate √36. Give only the requested number.
The nonnegative number with square 36 is 6. Result: 6.
Try it yourself now
50 Exercises · three difficulty levels · selection and number input
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: KMK Educational Standards Mathematics ESA/MSA. The topic assignment may vary by federal state.