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100-20=80 x(x-5)=x²-5x x²-5x+x+2x=x²-2x x²-2x=80 x²-2x-80=0 (x-10)(x+8)=0 x=10 x=-8 This is what i've done so far but i don't know what to do next
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25 votes
100-20=80

x(x-5)=x²-5x
x²-5x+x+2x=x²-2x
x²-2x=80
x²-2x-80=0
(x-10)(x+8)=0
x=10 x=-8
This is what i've done so far but i don't know what to do next

100-20=80 x(x-5)=x²-5x x²-5x+x+2x=x²-2x x²-2x=80 x²-2x-80=0 (x-10)(x+8)=0 x=10 x=-8 This-example-1
User AvielNiego
by
3.9k points

1 Answer

12 votes

Explanation:

x=10x=8

8=10x-8

8=9x

divide both side by 9

x=8 out of 9

User Quetzalcoatl
by
3.8k points
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