Step 1 :
After factoring out $ 8 $ we have:
$$ 56x^{2}-32x+48 = 8 ( 7x^{2}-4x+6 ) $$Step 2 :
Step 2: 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 3: Multiply the leading coefficient $\color{blue}{ a = 7 }$ by the constant term $\color{blue}{c = 6} $.
$$ a \cdot c = 42 $$Step 4: Find out two numbers that multiply to $ a \cdot c = 42 $ and add to $ b = -4 $.
Step 5: All pairs of numbers with a product of $ 42 $ are:
PRODUCT = 42 | |
1 42 | -1 -42 |
2 21 | -2 -21 |
3 14 | -3 -14 |
6 7 | -6 -7 |
Step 6: Find out which factor pair sums up to $\color{blue}{ b = -4 }$
Step 7: Because none of these pairs will give us a sum of $ \color{blue}{ -4 }$, we conclude the polynomial cannot be factored.