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Te ayudo a resolverla.
(7 - √x) (√x + 5) = 35
7√x + 35 - (√x)² - 5√x = 35
2√x - x = 0
2√x = x
(2√x)² = x²
4(√x)² = x²
4x = x²
x² - 4x = 0
x ( x - 4 ) = 0
x = 0 ó x-4 = 0
x = 0 ó x = 4