Question

solve pls....question 14....

Answer 1

hope it helps you. please mark it as brainliest answer.

Answer 2

$(0.4x + 0.5y)(0.16x {}^{2} - 0.2xy + 0.25 {}^{2} )$
for solving such questions you should know all identities.

The best identity which is suitable here is
$x {}^{3} + y {}^{3} = (x + y)(x {}^{2} - xy + y {}^{2} )$
so put the information in it
$(0.4x +0. 5y)(0.16x {}^{2} - 0.2xy + 0.25y {}^{2} ) \\ (0.4x +0. 5y)((0.4x) {}^{2} - 0.4 x\times 0.5y + (0.5y) {}^{2} \\ (0.4x ){}^{3} + (0.5y) {}^{3}$

0.64x^3+0.125y^3