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steposvetlana [31]
4 years ago
8

Y-1 = square root y+5 What value of y is a solution to the equation above?

Mathematics
1 answer:
otez555 [7]4 years ago
8 0

Answer:

y = 4

Step-by-step explanation:

y - 1 = √y + 5

(y - 1)² = y + 5 (Square both sides)

y² - 2y + 1 = y + 5 (Expand left side)

y² - 3y - 4 = 0 (Subtract y and 5 from both sides)

(y + 1) (y - 4) = 0 (Factor)

y = -1, 4 (Use ZPP)

When we check y = -1 we see that it is not a solution so the answer is y = 4.

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