Question

(+7x) (-3x) is what
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Answer 1

$\huge\tt\colorbox{gold}{\color{red}{Answer}}$

$= ( + 7x)( - 3x)$

$= - 21 {x}^{2}$

$\huge\tt\colorbox{gold}{\color{red}{Note}}$

When a position integer and a negative integer is multiplied the product will be a negative integer.

Answer 2

$7x \times - 3x$

$= > \: \: - 21x {}^{2}$