# How do you find the zeroes for #f(x) = x^2 – 9x – 70#?

##### 2 Answers

Mar 28, 2018

#### Explanation:

We need to think of two numbers, that, when I add them, sum up to

Through some thought, we arrive at

Thus, our equation is as follows:

To find the zeroes, we take the opposite signs to get

Hope this helps!

Mar 29, 2018

-5 and 14

#### Explanation:

To solve f(x), find 2 numbers (real roots) knowing the sum (-b = 9) and the product (c = - 70). They are: - 5 and 14.

**Note** . This method avoids proceeding the lengthy factoring by grouping and solving the 2 binomials.