Question

for what positive value of a does a-2√a+7 equal -4

Answer 1

a - 2√a + 7 = -4

a - 2 √a + 7 + 4 = 0

a - 2√a + 11 = 0

a^2 - 4a + 121 = 0 (squaring on both side)

solving the equation will give you the result.

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