# How do you factor #2x^2 -7x -15#?

##### 1 Answer

#### Answer:

Thought processes explained!

#### Explanation:

Whole number factor of 2 can only be {2 , 1}

Whole number factors of 15 are {1 , 15}; {3 , 5}

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Lets experiment!

We know that we have to start with:

Which when written as per convention is

We know that

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Try this:

For a start we have +15 and we need -15. Also the 7 from

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Try this:

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Try swapping the 3 and 5 around