(4x - 7)(4x + 7) + (2x - 9)(2x + 9) =  Choose the correct choice from the following choices:  A) 20x2 - 2x - 100  B) 20x2 - 130  C) 12x2 - 32  D) 12x2 + 32  E) None
Solution:   (4x - 7)(4x + 7) + (2x - 9)(2x + 9) =   [(4x)2 - 72] + [(2x)2 - 92] =   (16x2 - 49) + (4x2 - 81) =   16x2 - 49 + 4x2 - 81 =   20x2 - 130   Answer 20x2 - 130
<result>B</result>
(4x - 7)(4x + 7) + (2x - 9)(2x + 9) =