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ally0221
ally0221 ally0221
  • 30-01-2017
  • Mathematics
Answered

Please help ASAP


Which expressions are differences of squares?

Select each correct answer.

a^2+1

x^2−169

h^2−20

t^2−4

Verified Answer :

apologiabiology
apologiabiology apologiabiology
  • 30-01-2017

differnce is
a²-b²

frst one is not, that is sum
2nd one is, x²-13²
3rd on e is not, 20 is not a perfect square (but you could do h²-(√20)²)
4th one is t²-2²


2nd and 4th

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