anonymous
  • anonymous
how do you factor y^2 - 81
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Mertsj
  • Mertsj
It is the difference of two squares.
mathslover
  • mathslover
Hint: You can write 81 as \(9^2\) So, \(y^2 - 9^2 \)
mathslover
  • mathslover
Now use, \(\color{blue}{a^2 - b^2 = (a+b)(a-b)}\) identity.

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mathslover
  • mathslover
Can you do it now @MathProblems22 ?
anonymous
  • anonymous
So basically you square root the number and then write it using (a +b)(a - b)
mathslover
  • mathslover
Not exactly , we determine the square root of the number and write it as : (sq. root of the number)^2
mathslover
  • mathslover
So that it becomes in the form of \(a^2 - b^2\)

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