4x²- 12 + 9 solve the sum by using splitting method
Answers
Answer:
Step-by-step explanation:
The first term is, 4x2 its coefficient is 4 .
The middle term is, +12x its coefficient is 12 .
The last term, "the constant", is +9
Step-1 : Multiply the coefficient of the first term by the constant 4 • 9 = 36
Step-2 : Find two factors of 36 whose sum equals the coefficient of the middle term, which is 12 .
-36 + -1 = -37
-18 + -2 = -20
-12 + -3 = -15
-9 + -4 = -13
-6 + -6 = -12
-4 + -9 = -13
-3 + -12 = -15
-2 + -18 = -20
-1 + -36 = -37
1 + 36 = 37
2 + 18 = 20
3 + 12 = 15
4 + 9 = 13
6 + 6 = 12 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, 6 and 6
4x2 + 6x + 6x + 9
Step-4 : Add up the first 2 terms, pulling out like factors :
2x • (2x+3)
Add up the last 2 terms, pulling out common factors :
3 • (2x+3)
Step-5 : Add up the four terms of step 4 :
(2x+3) • (2x+3)