Question

please solve 11th and 12th question please fast

Answer 1

$11.\text{Given,}\\\text{length of two adjacent sides:}\\So, Length = 8x-3\\Breadth = 2x+5\\\\Area \ of \ rect. = l\times b\\~~~~~~~~~~~~~~~~~~~=(8x-3)(2x+5)\\~~~~~~~~~~~~~~~~~~~=8x(2x+5)-3(2x+5)\\~~~~~~~~~~~~~~~~~~~=16x^2+40x-6x-15\\~~~~~~~~~~~~~~~~~~~=\boxed{\boxed{16x^2+35x-15}}$


$12. (x^2-3xy+2y^2)(2x-3y)\\=2x(x^2-3xy+2y^2)-3y(x^2-3xy-2y^2)\\=2x^3-6x^2y+4xy^2-3x^2y+9xy^2+6y^3\\= \boxed{\boxed{2x^3-9x^2y+13xy^2+6y^3}}$