(? x 3) - 3 = 15help pls and i need the steps :/

Mathematics

1 answer:

marishachu [46]3 years ago

3 0

Answer:

Step-by-step explanation:

Lets make $x$ be the ? in the equation.

That becomes ( $x$ x 3) - 3 = 15.

First you have to add 3 on both sides. After doing that it gets to ( $x$ x 3) = 15 - 3.

Then you simplify it to 3 $x$ = 12.

Now you divide 3 on both sides. That gets to $x$ = 4 after doing it.

Hope this helped! If not, please let me know! <3

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Step-by-step explanation:

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3 years ago

Read 2 more answers

(x+16)²=12 plz help me and show work

Readme [11.4K]

Answer:

The answer is $x=-16$ ± $2\sqrt{3}$ in exact form or $x=-12.535898$ , $x=-19.464102$ in decimal form.

Step-by-step explanation:

To solve this problem, start by moving all terms to the left side of the equation and simplify. Simplify the equation by subtracting 12 from both sides of the equation and squaring $x+16$ , which will look like $x^{2} +32x+256-12=0$ . Next, simplify the equation again, which will look like $x^{2} +32x+244=0$ .

Then, use the quadratic formula to find the solutions. The quadratic formula looks like $\frac{-b(+-)\sqrt{b^{2}-4ac } }{2a}$ .

For this problem, the quadratic variables are as follows:

$a=1$

$b=32$

$c=244$

The next step is to substitute the values $a=1$ , $b=32$ , and $c=244$ into the quadratic formula and solve. The quadratic formula will look like $\frac{-32(+-)\sqrt{32^2-4(1*244)} }{2*1}$ . To simplify the equation, start by simplifying the numerator, which will look like $x=\frac{-32(+-)4\sqrt{3} }{2*1}$ . Then, multiply 2 by 1 and simplify the equation, which will look like $x=-16(+-)2\sqrt{3}$ . The final answer is $x=-16$ ± $2\sqrt{3}$ in exact form. In decimal form, the final answer is $x=-12.535898$ , $x=-19.464102$ .