Explanation What times itself will give x²?  Answer is x. What times itself will give 25?  Answer is 5. This problem is the difference of two squares. The factors are (x+5)(x-5).

Explanation What times itself will give 16?  Answer is 4. What times itself will give x²?  Answer is x. This problem is the difference of two squares. The factors are (4-x)(4+x).

Explanation What times itself will give 9y²?  Answer is 3y. What times itself will give 49?  Answer is 7. This problem is the difference of two squares. The factors are (3y-7)(3y+7).

Explanation What times itself will give (x-1)²?  Answer is (x-1). What times itself will give 4?  Answer is 2. This problem is the difference of two squares. The factors are ((x-1)-2) ((x-1)+2). Simplying these factors gives (x-3)(x+1).

Explanation What times itself will give 16y²?  Answer is 4y. What times itself will give 0.09?  Answer is 0.3 This problem is the difference of two squares. The factors are (4y-0.3)(4y+0.3).

Explanation What times itself will give 81c²?  Answer is 9c What times itself will give 144m²?  Answer is 12m This problem is the difference of two squares. The factors are (9c-12m)(9c+12m).

Explanation What times itself will give 4a²b²?  Answer is 2ab What times itself will give 49n^6?  Answer is 7n³ This problem is the difference of two squares. The factors are (2ab-7n³)(2ab+7n³).

Explanation What times itself will give p²?  Answer is p. What times itself will give 16/25?  Answer is 4/5 This problem is the difference of two squares. The factors are (p-4/5)(p+4/5).