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SVETLANKA909090 [29]
3 years ago
15

Solve the equation for x. 3/10x-1/5=-2

Mathematics
1 answer:
Ray Of Light [21]3 years ago
4 0
3/10x-1/5=-2

First we Add 1/5 to both sides

1/5+-2=-1.8

So our problem now becomes

3/10x1.8=-2
Now we have to divide both sides by 3/10

3/10/-2=-0.15


x=-0.15
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we have been asked to verify that -5, 1/2, and 3/4 are the zeroes of the cubic polynomial 4x^3+20x^2+2x-3

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Let f(x)=4x^3+20x^2+2x-3\\\\\text{when x=-5}\\\\f(-5)=4(-5)^3+20(-5)^2+2(-5)-3=-13\\\\\text{when x=}\frac{1}{2}\\

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Since sum of roots=\frac{-b}{a}= \frac{-20}{4}=-5\\

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