Asked by David
Solve using the quadratic formula
X^2-4x=21
X^2-4x=21
Answers
Answered by
drwls
Learn the quadratic formula:
x = [-b +/-sqrt(b^2 -4ac)]/2a
In your case a = 1, b = -4 and c = -21
x = [4 +/-sqrt(100)]/2
You finish it. You surely know what the square root of 100 is.
.
x = [-b +/-sqrt(b^2 -4ac)]/2a
In your case a = 1, b = -4 and c = -21
x = [4 +/-sqrt(100)]/2
You finish it. You surely know what the square root of 100 is.
.
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