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Answer:
x = root 3
Step-by-step explanation:
(2x + 4)^2 - (x-5)^2 = 26x
=> 4x^2 + 16 + 16x - (x^2 + 25 - 10x) = 26x
=> 4x^2 + 16 + 16x - x^2 - 25 + 10x = 26x
=> 3x^2 + 26x - 9 = 26x
=> 3x^2 - 9 = 0
=> 3x^2 = 9
=> x^2 = 3
=> x = root 3
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