2ax a 12 Which of these fit the pattern for a perfect square a NOTE Decide what a would need to be to get the x term Then check if that matches the constant term without the x NOTE The middle term with the x can be negative if the value of a is negative The constant term is always positive x 10x 20 2 182 81 10x 25 2 49 2 42 4 2 162 64 z 3x 6