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1.5.2 Surds

Card 1 of 21

What value does 25\sqrt{25}25​ denote, even though both 5 and -5 solve x2=25x^2=25x2=25?

A

999

B

25=5\sqrt{25}=\boldsymbol{5}25​=5, the positive square root.

C

The symbol a\sqrt{a}a​ denotes the positive square root of aaa. Keeping an irrational root as a surd gives an exact value.

D

x=2x=2x=2

Card 1 of 21

1.5.2 Surds Flashcards

  1. A Level
  2. /Maths
  3. /1.5.2 Surds

21 flashcards on AQA A Level Maths 1.5.2 Surds: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.

Flashcards