What is the area of.....

its a square, and it has 4x on the right.
and 5x+7 on the bottom


Also Another square, And it just has 3x and 4 as the exponent. I need help. please solve for me? thanks.



Also, a rectangle,
2x and 3 as the exponent. right side of the rectangle.
and on the bottom of the rectangle, 13+3x and 2 as the exponent.

1) it is a rectangle not a square

4x ( 5x+7) = 20x^2 + 28x ANSWER

2) 3x^4 X 3x^4 = 9x^8 ANSWER

3) 2x^3 X (13 +3x^2) = 26x^3 + 6x^5 ANSWER