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03-06-2018
Mathematics

contestada

Factorise completely
[tex]1) {x}^{2} - 12x - 13[/tex]
[tex] 2){32y}^{2} + 8y[/tex]
[tex]3) {x}^{2} - 9[/tex]

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03-06-2018

1. Number that adds up to -12 and multiplied by the same # that gives u -13. Set it up like this because both are negative so, u need 1 negative and 1 positive.
(x-13)(x+1)

2. Same rule applies. GCF
8y(4y+1)

3. (x+3)(x-3)

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