Answer:
Step-by-step explanation:
Given that the width of the frame of the painting is x inches wide and the dimension of the painting alone is 16 in by 20 in, it means that the combined length of the painting and the frame would be
20 + x + x = 20 + 2x
The combined width of the painting and the frame would be
16 + x + x = 16 + 2x
The quadratic quadratic function in standard form used to represent the combined area of the painting and frame is
(20 + 2x)(16 + 2x)
320 + 40x + 32x + 4x²
4x² + 72x + 320
