Question

expand using formula: (4x+2y+3)(4x+2y-3)

Answer 1

Answer:

{(4x+2y)+3}{(4x+2y)-3}

(4x+2y)²-(3)²

Answer 2

Answer:

16x^2 + 4y^2 + 16xy -9 is the answer.

Step-by-step explanation:

(4x+2y+3)(4x+2y-3)

= 4x(4x + 2y - 3) + 2y (4x + 2y - 3) + 3(4x + 2y -3)

= 16x^2 + 8xy - 12x + 8xy + 4y^2 - 6y + 12x + 6y - 9

= 16x^2 + 4y^2 + 16xy -9