Answer:
(pie - 6) times(4 pie+3)
Step-by-step explanation:
Multiply the coefficient of the first term by the constant 4 • -18 = -72
Find two factors of -72 whose sum equals the coefficient of the middle term, which is -21 .
-72 + 1 = -71
-36 + 2 = -34
-24 + 3 = -21
Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -24 and 3
4x2 - 24x + 3x - 18
Add up the first 2 terms, pulling out like factors :
4x • (x-6)
Add up the last 2 terms, pulling out common factors :
3 • (x-6)
Add up the four terms of step 4 :
(4x+3) • (x-6)
Which is the desired factorization
