Question

(2x + 5y)(2x − 5y) solve please

Answer 1

(a-b)(a+b)=a^2-b^2
so
(2x + 5y)(2x − 5y)=(2x)^2-(5y)^2=4x^2-25y^2

Answer 2

(2x)(2x)+(-5y)(2x)+(5y)(2x)+(5y)(-5y)
4x^2 -10xy + 10xy - 25y^2
4x^2-25y^2

Answer 3

4x^2-25y^2