If using the method of completing the square to solve the quadratic equation x2 + 3x + 21 = 0, which number would have to be added to "complete the square"?

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WasiF asked Feb 2, 2022

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7 votes

If using the method of completing the square to solve the quadratic equation

x2 + 3x + 21 = 0, which number would have to be added to "complete the
square"?

Mathematics
college

WasiF asked Feb 2, 2022

by WasiF

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15 votes

Answer:-18.75

Step-by-step explanation:x^2+3x+21-18.75=x^2+3x+2.25=

(x+1.5)^2=-18.75

Eyeballpaul answered Feb 2, 2022

by Eyeballpaul

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13 votes

Answer:

Explanation:

Kalyan Halder answered Feb 5, 2022

by Kalyan Halder

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