diketahui fungsi R(x) =2x² - x. hitunglah : R(2)+4R(x)-R(2x-1)

r(2)=2.2^2-2
=2.4-2
=6
4r(x)=4(2x^2-x)
= 8x^2-4x
r(2x-1)=2(2x-1)^2-(2x-1)
=2(4x^2-4x+1)-2x+1
= 8x^2-8x+2-2x-1
=8x^2-10x+1

jmlh semua=6+8x^2-4x-(8x^2-10x+1)
= 6x+5