Step 1 :
After factoring out $ 2 $ we have:
$$ 4w^{2}+26w+22 = 2 ( 2w^{2}+13w+11 ) $$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 $\color{blue}{ a = 2 }$ by the constant term $\color{blue}{c = 11} $.
$$ a \cdot c = 22 $$Step 4: Find out two numbers that multiply to $ a \cdot c = 22 $ and add to $ b = 13 $.
Step 5: All pairs of numbers with a product of $ 22 $ are:
PRODUCT = 22 | |
1 22 | -1 -22 |
2 11 | -2 -11 |
Step 6: Find out which factor pair sums up to $\color{blue}{ b = 13 }$
PRODUCT = 22 and SUM = 13 | |
1 22 | -1 -22 |
2 11 | -2 -11 |
Step 7: Replace middle term $ 13 x $ with $ 11x+2x $:
$$ 2x^{2}+13x+11 = 2x^{2}+11x+2x+11 $$Step 8: Apply factoring by grouping. Factor $ x $ out of the first two terms and $ 1 $ out of the last two terms.
$$ 2x^{2}+11x+2x+11 = x\left(2x+11\right) + 1\left(2x+11\right) = \left(x+1\right) \left(2x+11\right) $$