Answer:
22
Step-by-step explanation:
vhc,dsvhjcdshscljab.kdjbca
(7y + 3x)(7y - 3x)
a² - b² = (a + b)(a - b)
49y² - 9x² = (7y)² - (3x)² {a = 7y ; b - 3x}
= (7y + 3x)(7y - 3x)
b or c I'm not for sure
hope this helps
