The method of cross multiplication: the multiplication on the left side of the cross is equal to the quadratic term coefficient, the multiplication on the right side is equal to the constant term, and the multiplication and addition of the cross are equal to the linear term coefficient.

Think of the formula you wrote as a quadratic equation about X, where A, B and Y are constant factors.

Therefore, according to the method of cross multiplication, the coefficient of the quadratic term is 2a^2, so the two terms on the left are ax and 2ax (because the middle term is a power of a, it cannot be divided into 2 and a 2). Similarly, the two items on the right are by and -3by (you only need to calculate which one is put before the minus sign). This formula is very convenient, because there is only one possibility to multiply the constant coefficients 2 and 3.

So the frame diagram of cross multiplication is ax by, and the buddy above has already given it.

2ax -3by

The result is (ax+by)(2ax-3by). In fact, after the two items on the left and the two items on the right are determined, the answer is already obvious. Thank you.