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4 years ago

Simplify the expression-3÷(-2/5)

Mathematics

2 answers:

inessss [21]4 years ago

5 0

Answer:

Step-by-step explanation:

(-3)÷(-2/5)

KFC method

Keep the first number, Flip the second number & Change division to multiplication

$(-3)*\frac{-5}{2}=\frac{15}{2}$

$=7\frac{1}{2}\\$

Count the number of negative sign.

If number of negative sign is even, then the result will be a positive number

Here 2 negative sign. So result will be an positive number

BARSIC [14]4 years ago

3 0

Answer:

15/2 or 7.5

Step-by-step explanation:

-3÷ (-2/5)

The reciprocal of -2/5 is -5/2

So we multiply -3 into the reciprocal of the fraction and we can get the same answer

Therefore,

-3÷(-2/5)

= -3x -5/2

= (-5x-3)/2

(Two negatives become a positive)

= 15/2 in fraction form

And 7.5 in decimal form

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How do you factor n^3+1000

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Steps
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3 years ago

Find the solutions of the equation x4 − 2x3 − x2 + 2x = 0. (Enter your answers as a comma-separated list.)

Bad White [126]

Answer:

$S=\left \{ 0,-1,1,2 \right \}$

Step-by-step explanation:

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As if it was a quadratic one.

$x^{4}-2x^{3}- x^{2} + 2x = 0\\x(x^{3}-2x^{2}-x+2)=0 \:Factoring \:out\\x[(x^{3}-2x^{2})+(-x+2)]=0 \:Grouping\\x[\mathbf{x^{2}}(x-2)+\mathbf{-1}(x+2)]=0 \:Rewriting\:the\:first\:factor\\x(x^{2}-1)(x-2)\:Expanding \:the \:first \:factor\\x(x-1)(x+1)(x-2)=0\\x=0,x=1,x=-1,x=2\\S=\left \{ 0,-1,1,2 \right \}$