Middle School

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------------------------------------------------ Factorize [tex]y^2 - 169[/tex].

Answer :

Step 1. Rewrite it in the form: [tex] a^{2} - b^{2} [/tex], where a = y and b = 13

[tex] y^{2} - 13^{2} [/tex]

Step 2. Use Difference of Squares: [tex] a^{2} - b^{2} =(a+b)(a-b)[/tex]

[tex](y+13)(y-13)[/tex]

Done!
= y^2 - 169
= (y)^2 - (13)^2
= (y + 2)(y - 2)

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