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allochka39001 [22]
3 years ago
14

X^2-7x=18 solve for x please show work

Mathematics
1 answer:
zloy xaker [14]3 years ago
3 0
So the answer is, x1=-2, x2=9
x^2-7x=18
x^2-7x-18=0
x^2+2x-9x-18=0
x*(x+2)-9(x+2)=0
(x+2)*(x-9)=o
x+2=0
x-9=0
X=-2
X=9
I hope u understand!
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twice a number,n, subtracted form 36 is less than 15 more than one third the number. Find all possible values for the number. SH
garri49 [273]
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36 - 2n < 15 + 1/3n   Subtract 15 from both sides
21 - 2n < 1/3n           Add 2n to both sides
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         n > 9

The possible values for the number are anything over 9.


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3 years ago
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Gave her a 4.50​$ tip. The tip was 9​% of the cost of the . Write an equation to find​ b, the cost?
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Answer:

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Here's a good formula I use for finding percentages.

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