Question

a^2+ab−2a−2b. pls tell me ans

Answer 1

Answer:

a2b+ab-2a-2b

a2+2a+ab+2b=a.(a+b)+2

.(a+b)=(a+2).(a+b)

Answer 2

Question :

Factorise :

$\longrightarrow \sf {a}^{2} + ab - 2a - 2b$

Solution :

$\longrightarrow \sf {a}^{2} + ab - 2a - 2b$

➢ We need to factorise it. So, here we will use grouping method. Means we need to group such terms so that we get common.

➢ Here, we're grouping a² and ab together and -2a and - 2b together.

$\longrightarrow \sf ({a}^{2} + ab )(- 2a - 2b)$

$\longrightarrow \sf a({a}^{} + ab) - 2(a + b)$

$\red{ \longrightarrow \underline{\boxed{ \bf(a + b)(a - 2)}} \: \bigstar}$

Hence, factorised..!!

More Information :

More algebraic identities :

• (a + b)² = a² + 2ab + b²
• (a - b)² = a² - 2ab + b²
• a² - b² = (a + b)(a - b)
• (a + b)² = (a - b)² + 4ab
• (a - b)² = (a + b)² - 4ab
• (a + b)² + (a - b)² = 2(a² + b²)
• (a + b)³ = a³ + b³ + 3ab(a + b)
• (a - b)³ = a³ - b³ - 3ab(a - b)