Find The Indicated Product Of (2r-5) (2r-5), Show Your Solution :)

Find the indicated product of (2r-5) (2r-5)

show your solution :)

 

using FOIL method

(2r-5) (2r-5)

First term

(2r)(2r) = 4r^2

Outer term

(2r)(-5) = -10r

Inner term

(-5)(2r) = -10r

Last term

(-5)(-5) = 25

4r^2 - 10r - 10r + 25

4r^2 - 20r + 25

or by using the algebraic property thingie

such that (a - b)(a - b) = a^2 - 2ab + b^2

(2r-5) (2r-5)

a = 2r

b = 5

so

4r^2 - 2(2r)(5) + 25

4r^2 -20r + 25