i need some help on this algebra problem, with the quadratic formula?
“Solve 8x = x^2 - 9 using the Quadratic Formula, Show all work?”
“Solve 8x = x^2 - 9 using the Quadratic Formula, Show all work?”
Krishnamurthy
8x = x^2 - 9
x^2 - 8x - 9 = 0
25 - (x - 4)^2 = 0
5^2 - (x - 4)^2 = 0
-(x - 9)(x + 1) = 0
x = -1, 9
Como
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x² - 8x - 9 = 0
x = [ 8 ± √(64 + 36) ] / 2
x. = [ 8 ± 10 ] / 2
x = - 1 , 9
mizoo
ax^2 + bx + c = 0
d = b^2 - 4ac
x = (-b ± √d)/(2a)
in your case, a = 1, b = -8, c = -9
d = (-8)^2 - 4(1)(-9)
d = 100
x = (-(-8) ± √100)/(2 * 1)
x = (8 ± 10)/2
x = -1, 9
llaffer
You can learn what was shown in the previous question and you can solve for this yourself.
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