Question

(5x + 7) * ( 3x + 4 )

Answer 1

Answer :

(5x + 7) * ( 3x + 4 )

⇒ 5x ( 3x + 4 ) + 7 ( 3x + 4 )

⇒ 15x² + 20x + 21x + 28

⇒ 15x² + 41x + 28

_______________________

★ Related Identities -

• (a + b)(a - b) = a² - b²
• (a + b)² = a² + 2ab + b²
• (a - b)² = a² - 2ab + b²

Answer 2

Solution:

(5x + 7)(3x+4)

→5x(3x+4) + 7 (3x + 4)

→15x² + 20x + 21x + 28

→15x² + 41x + 28

• 15x² + 41x + 28

Identity Rules:

• ( a² - b² ) = (a+b)(a-b)
• (a + b)² = a² + b² + 2ab
• ( a - b)² = a² + b² - 2ab