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Y = –16x² + 121x + 107

User Pkoch
by
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1 Answer

6 votes

Answer:

x = 121/32 + sqrt(21489)/32 or x = 121/32 - sqrt(21489)/32

Explanation:

Solve for x over the real numbers:

-16 x^2 + 121 x + 107 = 0

Divide both sides by -16:

x^2 - (121 x)/16 - 107/16 = 0

Add 107/16 to both sides:

x^2 - (121 x)/16 = 107/16

Add 14641/1024 to both sides:

x^2 - (121 x)/16 + 14641/1024 = 21489/1024

Write the left hand side as a square:

(x - 121/32)^2 = 21489/1024

Take the square root of both sides:

x - 121/32 = sqrt(21489)/32 or x - 121/32 = -sqrt(21489)/32

Add 121/32 to both sides:

x = 121/32 + sqrt(21489)/32 or x - 121/32 = -sqrt(21489)/32

Add 121/32 to both sides:

Answer: x = 121/32 + sqrt(21489)/32 or x = 121/32 - sqrt(21489)/32

User Khurrum Qureshi
by
5.0k points
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