2*k + 3 = 13
2*k = 13 - 3
2*k = 10
k = 10/2
k = 5
Answer:
Step-by-step explanation:
Use the identity: a² - b² = (a + b)(a- b)
4 - 9w² = 2² - (3w²)
= (2 + 3w)(2 - 3w)