Penjelasan dengan langkah-langkah:

you can solve to find the length of the sides of square B.

to find the area, we can multiply the length and height of figure A. because the length of A is known, we have to find the height of the side of A. that's why we need to solve the sides of square B from the area, because the length of side B is equal to the height of the A side

the A area equal to,

in factorial,

because in this case it is a flat shape, surely the result of the length is not negative but positive.

so, area of A same equal to

A = (2x²+3x-14) Cm²

I hope this helps :)