Question

simply (x-5) (x+5) + 5​

Answer 1

${\bigstar}$ ANSWER:

(x-5)(x+5)

IDENTITY USED:

$\boxed{\sf{(a+b)(a-b) = a² - b²}}$

here,

• a = x
• b = 5

applying above identity,

☛(x-5)(x+5)

☛(x)² - (5)²

☛x² - 25 ➜1️⃣

In this problem,

☛(x-5) (x+5) + 5

☛x² - 25 + 5 (from (1️⃣) )

☛x² - 20