4x times 4x equals 16x2.
16x2 - 25 = (4x + 5) ( 4x - 5)
16x2 - 25 = (4x + 5) (4x - 5)
There is a formula for the "difference of squares." In this case, the answer is (4x + 3)(4x - 3)
16x2+56xy+49y2
16x2 - 49 = 42x2 - 72 = (4x)2 - 72 = (4x - 7)(4x + 7)
4x times 4x equals 16x2.
16x2 + 8x + 1 = 0 : This factorises to (4x + 1)(4x + 1) = 0 When 4x + 1 = 0 then 4x = -1 : x = -1/4.
16x2 - 25 = (4x + 5) ( 4x - 5)
It is: 4-16x2 = (2-4x)(2+4x) when factored
16x2 - 25 = (4x + 5) (4x - 5)
16x2 + 40x + 25 = 16x2 + 20x + 20x + 25 = 4x(4x + 5) + 5(4x + 5) = (4x + 5)(4x + 5) = (4x + 5)2
If that's 16x2 + 72x + 81, that factors to (4x + 9)(4x + 9) or (4x + 9)2
(4x-3)(4x+3)
(4x - 7)(4x + 7)
(4x + 6)(4x - 6)
(4x-8)2 = (4x-8)(4x-8) = 16x2-32x-32x+64 = 16x2-64x+64