Question

Solve Using Suitable Identities in Factorisation
(2V5a + V3)(2V5a - 13)

V stands for Square Root
Pls solve this with the steps.I need it ASAP.Plssssss

Answer 1

Answer:

Step-by-step explanation:

Given,

( 2√5 a + √3 ) ( 2√5 a - √3 ) [ ∵ ( a + b ) ( a - b ) = a ^2 - b ^2 )

= ( 2√5 a )^2 - ( √3 )^2 ( ∵This symbol ^ means square )

= ( 2√5 )^2 × a^2 - ( √3 )^2

= ( 2 )^2 × ( √5 )^2 × a^2 - ( √3 )^2

= 4 × 5 × a^2 - 3 ( ∵ square and roots are cancelled )

= 20 a^2 - 3 is the answer.