Explanation:
The area of a parallelogram is b * h, where b is the base and h is the height. We'll call the height x and the base x + 4, and we know that this is equal to 45.
x (x + 4) = 45
x² + 4x = 45
x² + 4x - 45 = 0
(x + 5)(x - 4) = 0
x = -5, 4 → x = 4 (no negative sides)
Therefore, base is 8 and height is 4. Hope this helps!