It seems that $ 2x^{2}-55x-63 $ cannot be factored out.
Step 1: Identify constants $ a $ , $ b $ and $ c $.
$ a $ is a number in front of the $ x^2 $ term $ b $ is a number in front of the $ x $ term and $ c $ is a constant. In this case:
Step 2: Multiply the leading coefficient $\color{blue}{ a = 2 }$ by the constant term $\color{blue}{c = -63} $.
$$ a \cdot c = -126 $$Step 3: Find out two numbers that multiply to $ a \cdot c = -126 $ and add to $ b = -55 $.
Step 4: All pairs of numbers with a product of $ -126 $ are:
PRODUCT = -126 | |
-1 126 | 1 -126 |
-2 63 | 2 -63 |
-3 42 | 3 -42 |
-6 21 | 6 -21 |
-7 18 | 7 -18 |
-9 14 | 9 -14 |
Step 5: Find out which factor pair sums up to $\color{blue}{ b = -55 }$
Step 6: Because none of these pairs will give us a sum of $ \color{blue}{ -55 }$, we conclude the polynomial cannot be factored.