Question

If the length and breath of a rectangle are (10-x)&(x+3) find the area of rectangle

Answer 1

It is simple mate....
Area of a rectangle
= Length × Breadth
$= (10 - x)( x + 3) \\ = 10x + 30 - {x}^{2} - 3x \\ = - {x}^{2} + 7x + 30$
So
$- {x}^{2} + 7x + 30$
is the right answer.
If it helped you PLEASE MARK MY ANSWER AS THE BRAINLIEST ANSWER