Question

Use suitable identity to find the following product: (5x+4)(5x+10)​

Answer 1

I thinks answer is

10x²+40

Answer 2

Answer:  (5x+4)(5x+10)​= 25x² + 70x + 40

Step-by-step explanation: Lets use the identity (x + a)(x + b) = x² + x( a + b) +ab

Now in (5x+4)(5x+10)​

So here 5x = x

             4 = a

and 10 = b

So using the identity

(5x+4)(5x+10)​ = (5x)² + 5x( 4 + 10) + (4)(10)

= 25x² + 70x + 40

Therefore using the identity  (x + a)(x + b) = x² + x( a + b) +ab we found out the value of (5x+4)(5x+10)​ which is 25x² + 70x + 40.

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