Question

Use suitable identities to find: i)201×199 ii)(2x+5)^2-(2x-5)^2

Answer 1

Answer:

39999

Step-by-step explanation:

(201)*(199)

(200+1)(200-1)

(a+b)(a-b)= (a^2)-(b^2)h

=(200)^2-(1)^2

=39999

Answer 2

Step-by-step explanation:

i Hope answer is helpful for you