Question

(3x+y2)-3x(3x+2y) при y=3.5​

Answer 1

$(3x +3.5 times 2) - 3x(3x +2 times 3.5)$

(3х+7)-3х(3х+7)

$= (3x + 7) - (9 {x}^{2} + 21x)$