Question

How can I solve this ?

Answer 1

`\left((2)/(5)a^2x\right)\left(-(1)/(5)x^2a\right)=\left((2)/(5)\right)\left(-(1)/(5)\right)(a^2xx^2a)=-(2)/(25)a^(2+1)x^(1+2)\\\\=\boxed{-(2)/(25)a^3x^3}`