4 years ago

Please some one a little help...

Mathematics

1 answer:

jekas [21]4 years ago

4 0

Answer:

Everything is correct except for the very last one which should be "irrational."

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Select all the expressions that are equivalent to 10x + 4 - (6x - 1)

Travka [436]

Answer:

4x + 5

Step-by-step explanation:

10x + 4 - 6x + 1

= 4x + 5

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3 years ago

How many terms are In This expression 7+10b

jenyasd209 [6]

Answer:

one term is in this expression

Step-by-step explanation:

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sertanlavr [38]

He really enjoys swinging nightclubs

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3 years ago

Find all the zeros of the equation

lapo4ka [179]

Divide both sides by -3, and replace $x^2$ with $y$ . Then

$-3x^4+27x^2+1200=0\iff y^2-9y-400=0$

Factorize the quadratic in $y$ to get

$y^2-9y-400=(y+16)(y-25)=0\implies y=-16,y=25$

which in turn means

$x^2=-16,x^2=25$

But $x^2\ge0$ for all real $x$ , so we can ignore the first solution. This leaves us with

$x^2=25\implies x=\pm\sqrt{25}=\pm5$

If we allow for any complex solution, then we can continue with the solution we ignored:

$x^2=-16\implies x=\pm\sqrt{-16}=\pm i\sqrt{16}=\pm4i$

6 0

4 years ago