amandapill
12.01.2020 •
Mathematics
Solve the quadratic equation by completing the square . x ^ 2 + 4x - 3 = 0
a) x=4 pm sqrt 7
b) x=2 pm sqrt 7
c)x=-4 pm sqrt 7
d) x=-2 pm sqrt 7
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Ответ:
D
Step-by-step explanation:
x²+4x=3
add 4 both sides
x²+4x+4=7
(x+2)²=7
x=-2±√7
Ответ:
___ had 6 cookies she gave 1/3 cookies to. How many cookies does have left?
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