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3 years ago

Is the open sentence 3z = 2z + 5 true or false when z = 5?

Mathematics

2 answers:

USPshnik [31]3 years ago

7 0

Answer:

Your answer to your question is FALSE!!!!!!

satela [25.4K]3 years ago

5 0

Answer:

True

Step-by-step explanation:

Plug the value of z in: 3(5) = 2(5) + 5
Simplify: 15 = 10 + 5
10 + 5 = 15
So, the open sentence is true.

I hope this helps!

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2 years ago

Which of the following are solutions to the equation below?

scoundrel [369]

Answer:

The correct options for the solution values are:

$x=2\sqrt{2}-5$

$x=-2\sqrt{2}-5$

Step-by-step explanation:

Given the expression

$x^2+10x+25=8$

Subtract 25 from both sides

$x^2+10x+25-25=8-25$

Simplify

$x^2+10x=-17$

Add 25 or 5² to both sides

$x^2+10x+5^2=8$

$x^2+10x+5^2=\left(x+5\right)^2$

so the expression becomes

$\left(x+5\right)^2=8$

$\mathrm{For\:}f^2\left(x\right)=a\mathrm{\:the\:solutions\:are\:}f\left(x\right)=\sqrt{a},\:-\sqrt{a}$

solve

$x+5=\sqrt{8}$

Subtract 5 from both sides

$x+5-5=2\sqrt{2}-5$

$x=2\sqrt{2}-5$

solve

$x+5=-\sqrt{8}$

Subtract 5 from both sides

$x+5-5=-2\sqrt{2}-5$

$x=-2\sqrt{2}-5$

Therefore, the solution to the equation

$x=2\sqrt{2}-5,\:x=-2\sqrt{2}-5$

Hence, the correct options for the solution values are:

$x=2\sqrt{2}-5$

$x=-2\sqrt{2}-5$

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3 years ago

What is the exponent of 20

Ilia_Sergeevich [38]

I think it is 0 because I googled it.

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3 years ago

Read 2 more answers