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How do you solve S squared plus 4s minus 21 equals 0 by using complete the square?
Wiki User
∙ 6y ago
Equation: s^2 +4x -21 = 0
Completing the square: (s+2)^2 -4 -21 = 0 => (s+2)^2 = 25
Square root both sides: s+2 = +5 or -5
Subtract 2 from both sides: s = 3 or s = -7
Wiki User
∙ 6y ago
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