Question

Prove that (3x + 7)2 – 42x = 9x2 + 49​

Answer 1

Answer:

Solution :-

✪ (3x + 7)² - 42x = 9x² + 49

L.H.S :-

❂ (3x + 7)² - 42x

➙ (3x)² + 2 × 3x × 7 + (7)² - 42x

➙ 9x² + 42x + 49 - 42x

➙ 9x² + 42x - 42x + 49

➙ 9x² + 49

R.H.S :-

✱ 9x² + 49

➩ 9x² + 49

∴ L.H.S = R.H.S (Proved)

Formula used :-

✯ (a + b)²

➔ a² + 2ab + b²

Answer 2

Step-by-step explanation:

Hope this answer helps you !!!!!