Simplify
​$$(1.5a^2 - 2.5b^2)(1.5a^2 + 2.5b^2) + 6.25ab$$​​

Correct option is D

Given:

​$$(1.5a^2 - 2.5b^2)(1.5a^2 + 2.5b^2) + 6.25ab$$​​

Formula Used:

​$$(x - y)(x + y) = x^2 - y^2$$​​

Solution:

x = 1.5a² & y = 2.5b² 

using this in given equation;

​$$(1.5a^2)^2 - (2.5b^2)^2 + 6.25ab\\ \ \\ = 2.25a^4 - 6.25b^4 + 6.25ab$$​​

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