[2] ∫(4x+8x)dx
=83x32+16x+C
Step 1 :∫(4x+8x)dx=∫(4x12+8x−12)dx
Step 2 :=4∫x12dx+8∫x−12dx
Step 3 :=4(23x32)+8(2x12)+C
Step 4 :=83x32+16x+C