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missMary1
@missMary1
November 2021
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max487
1) x²-5x=0
x*(x-5)=0
x=0
x-5=0
x=0
x=5
x¹=0, x²=5
___________
2)8x³+6x=0
2x*(4x²+3)=0
x*(4x²+3)=0
x=0
4x²+3=0
x=0
x=0
____________
3)x²-6x-7=0
x=-(-6)±√(-6)²-4*1*(-7)
-------------------------
2*1
x=6±√36+28
--------------
2
x=6±√64
---------
2
x-6±8
------
2
x=6+8
-----
2
x=6-8
----
2
x=7
x=-1
x¹=-1, x²=7
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Answers & Comments
x*(x-5)=0
x=0
x-5=0
x=0
x=5
x¹=0, x²=5
___________
2)8x³+6x=0
2x*(4x²+3)=0
x*(4x²+3)=0
x=0
4x²+3=0
x=0
x=0
____________
3)x²-6x-7=0
x=-(-6)±√(-6)²-4*1*(-7)
-------------------------
2*1
x=6±√36+28
--------------
2
x=6±√64
---------
2
x-6±8
------
2
x=6+8
-----
2
x=6-8
----
2
x=7
x=-1
x¹=-1, x²=7