Question

Find the value of (2a-1)(a+1) for a=1​

Answer 1

We have to find the value of ( 2a - 1 )(a + 1 ) on putting the value of a = 1

Substituting value in equation :

( 2a - 1 )(a + 1 )

=> ( 2 × 1 - 1 )(1 + 1 )

=> ( 2 - 1 )(2)

=> 1 × 2

=> 2

Hence, our required answer is 2

Answer 2

$\rm{ \underline{ \huge{Given: }}}$

• Algebraic expression is (2a – 1)(a + 1)
• Value of a = 1

$\rm{ \underline{ \huge{ To \: \: find: }}}$

• Value of algebraic expression

$\rm{ \underline{ \huge{Solution: }}}$

$\large{ \tt \implies \: \: \: \: \: \: \: \: \: (2a - 1)(a + 1)}$

Put the value of a as 1,

$\large{ \tt \implies \: \: \: \: \: \: \: \: \: (2 \times 1 - 1)(1 + 1)}$

$\large{ \tt \implies \: \: \: \: \: \: \: \: \: (2 - 1)(2)}$

$\large{ \tt \implies \: \: \: \: \: \: \: \: \: 1 \times 2}$

$\large{ \tt \implies \: \: \: \: \: \: \: \: \: 2}$

$\rm{ \underline{ \huge{Hence:}}}$

The value of algebraic expression is 2