Question

Use the suitable identity and find their products. ??

(i) (4x+5)(4x-1)

(ii) (2a2+9)(2a2+5)​

Answer 1

$\huge\colorbox{pink}{ Solution࿐}$

i) ( 4x + 5 ) ( 4x - 1 )

Identity = ( a + b ) ( a - b ) = x^2 + ( a + b )x + ab

putting a = 5 and b = 1

4^2 + ( 5 + 1 )4^2 + ( 5 × 1 )

16 + ( 6 × 16 ) + 5

16 + 96 + 5

117