Question

Find the value of X(2x + 4) (2x-9)

Answer 1

Answer:

0, -2, 9/2

Step-by-step explanation:

(2x^2 + 4x) (2x-9)

Then Foil

4x^3 + 8x^2 - 18x^2 -36x

Pull out a x

x(4x^2-10x-36)

x=0

(2x-9)(2x+4)=0

X= 9/2 x= -2

Answer 2

2x +4)° 2x-9)°= 4x  2 +8x−9=3

 Pull out like factors :

  2x + 4  =   2 • (x + 2) (4 • (x + 2) • x) -  9

4x • (x + 2) -  9

Factoring  4x2+8x-9  

The first term is,  4x2  its coefficient is  4 .

The middle term is,  +8x  its coefficient is  8 .

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   8 .

     -36    +    1    =    -35  

     -18    +    2    =    -16  

     -12    +    3    =    -9  

     -9    +    4    =    -5  

     -6    +    6    =    0  

     -4    +    9    =    5  

     -3    +    12    =    9  

     -2    +    18    =    16  

     -1    +    36    =    35

x=3