Answer:
(5h-4t)(5h+4t)
Step-by-step explanation:
25h² - 16t²
adding and subtracting 20ht from it (√25 and √16 = 5x4 = 20):
25h² + 20ht - 20ht -16t²
factor:
(5h - 4t)(5h + 4t)
25 h² - 16t² ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b)
Then
= (5h)² - (4t)²
= (5h - 4t)(5h + 4t) ← in factored form
