Question

(x²+y²)(3x-5y) find the values​

Answer 1

$\sf{\left(x^2+y^2\right)\left(3x-5y\right)}$

$\sf{=x^2\cdot \:3x+x^2\left(-5y\right)+y^2\cdot \:3x+y^2\left(-5y\right)}$

$\sf{=3x^2x-5x^2y+3xy^2-5y^2y}$

$\sf{=3x^3-5x^2y+3xy^2-5y^3}$