Question

Urgent, ajutati-ma la exercitiul 3 va rog... Ce puteti.. Dau coroana!! ​

Answer 1

Răspuns:

Explicație pas cu pas:

3. a) (x+2)(x-2) = x² - 2² = x² - 4

b) (a+3)(a-3) = a² - 3² = a² - 9

c) (5+x)(5-x) = 5² - x² = 25 - x²

d) (4a-2c)(4a+2c) = (4a)² - (2c)² = 16a² - 4c²

e) (2x+1)(2x-1) = (2x)² - 1² = 4x² - 1

f) (2y-5x)(2y+5x) = (2y)² - (5x)² = 4y² - 25x²

g) (m+3n)(m-3n) = m² - (3n)² = m² - 9n²

h) (t-2z)(t+2z) = t² - (2z)² = t² - 4z²

i) (12a-x)(12a+x) = (12a)² - x² = 144a² - x²