Answer:
- - 6 + 2√17 or approximately 2.25 in
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The area of the photo is:
Area of the ad is:
- A(ad) = (8 + x)(4 + x) = x² + 12x + 32
Area of the photo is half the area of the entire ad:
- 32 = (x² + 12x + 32)/2
- 64 = x² + 12x + 32
- x² + 12x - 32 = 0
- x = (-12 ± √(12² - 4(-32)))/2
- x = -6 ± 2√17
Only positive root makes sense: