Expand and simplify the expression: 5x(4x+7y)-2x(3y+9x)

Answer 1

First, distribute the terms inside the parentheses:

= 20x^2 + 35xy - 6xy - 18x^2
= (20x^2 - 18x^2) + (35xy - 6xy)
= 2x^2 + 29xy

Therefore, the expanded and simplified expression is 2x^2 + 29xy.