1) x^2 - 16 = (x + 4)(x - 4)
2) y^2 - 100 = (y + 10)(y - 10)
3) a^2 - 4 = (a + 2)(a - 2)
4) c^2 - 0.25 = (c + 0.5)(c - 0.5)
1) x^2 - 16 = (x + 4)(x - 4)
2) y^2 - 100 = (y + 10)(y - 10)
3) a^2 - 4 = (a + 2)(a - 2)
4) c^2 - 0.25 = (c + 0.5)(c - 0.5)