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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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How do I do numbers 1, 2 and 3
stiks02 [169]
What you want to do for each of those is follow the formula, y-y[1]=m(x-x[1]). When I say y[1] and x[1], I mean the x and y values given. So the first one would be y-4=-3(x-(-1)). Then you solve for y by distributing the -3 to x and +1 (+1 because two negatives make a positive), making the equation
y-4=-3x-3. Then you subtract the 4. Answer #1. y=-3x-7. 

#2. 
y-1=1(x-4)
y-1=x-4
y=x-5

#3.
y-2=2(x-(-1))
y-2=2x+2
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Hope this helped you!

8 0
2 years ago
What will the last payment be to pay off a $1,250 computer plus 8% sales tax with monthly payments of $120?
GrogVix [38]
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8 0
3 years ago
Please help with this problem <br> 2x/3−6=4
Zarrin [17]
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5 0
3 years ago
Read 2 more answers
26. Simplify the expression below completely.<br> 4(5w - 3) -(w - 1)<br> Please help me!!
Veseljchak [2.6K]
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4 0
3 years ago
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Use the commutative property to simplify the expression 4/3 + 3/4 + 2/3
saw5 [17]

The simplified expression using  the commutative property is : \frac{6}{3} + \frac{3}{4}

<h3>Meaning of commutative property</h3>

commutative property can be defined as a mathematics attribute that is possessed by a mathematical equation, that enables the objects undergoing addition or multiplication to change position.

In conclusion, The simplified expression using  the commutative property is : \frac{6}{3} + \frac{3}{4}

<h3>Analysis</h3>

4/3 + 3/4 + 2/3 =  ( \frac{4}{3} +  \frac{2}{3} ) +  \frac{3}{4}  =   \frac{6}{3} + \frac{3}{4}

Learn more about commutative property: brainly.com/question/1528288

#SPJ1

7 0
2 years ago
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