( 1)4x? - 16y? -4x+ 1
=(4x? -4x+ 1)- 16y?
=(2x- 1)? - 16y?
=(2x- 1)? -(4y)?
=(2x- 1+4y)(2x- 1-4y)
②(x? -2x)? -(x? -2x)-6
=(x? -2x-3)(x? -2x+2)
Question (2) should be X? -2x as a whole, if regarded as a, then the original formula is a? -a-6
Then use cross multiplication (if cross multiplication is not taught, there should be pq formula)
Decompose -6 into the product of -3 and 2, decompose.