Question

6. Factoriza: 4x2 –(x + 5)2
9. Factoriza: (5x + 3)2 – (3x – 5)2

Answer 1

6. (2x-(x+5))(2x+(x+5))

(2x-x-5)(2x+x+5)

(x-5)(3x+5)

9. (5x+3-(3x-5))(5x+3+(3x-5))

(5x+3-3x+5)(5x+3+3x-5)

(2x+8)(8x-2)

2 (x+4)×2 (4x-1)

2×2 (x+4)(4x-1)

4 (x+4)(4x-1)

Saludos :)