All categories

3 years ago

What are the solutions to the equation (x-5)(2x+4)=0?

Mathematics

1 answer:

snow_lady [41]3 years ago

7 0

Answer: C

Step-by-step explanation:

Equal both to zero.

$x-5=0\\x=5$

---------------------------------

$2x+4=0\\2x=-4\\x=-\frac{4}{2}\\ x=-2$

You might be interested in

1. Write the nth term of the following sequence in terms of the first term of the sequence. 10, 20, 40, . . . 2.Write the nth te

ozzi

Hello,

1)
$a_{0}=5$
$a_{1}=2*5$
$a_{2}=2^2*5$
$a_{3}=2^3*5$
...
$a_{n}=2^{n-}*5$

2)

$u_{1}=a$
$u_{2}=a+4$
$u_{3}=a+2*4$
$u_{4}=a+3*4$
...
$u_{n}=a+(n-1)*4$

8 0

4 years ago

What distance does each unit of the grid represent?

DerKrebs [107]

The units add 20 to it, for example. 20,40,60, and 80.

5 0

3 years ago

Read 2 more answers

Can yall please hwith this the question is the pic

Sloan [31]

D is the answer for this problem

4 0

4 years ago

A jeweler wants to make 14 grams of an alloy that is precisely 75% gold.. The jeweler has alloys that are 25% gold, 50% gold, &a

Goryan [66]

Given that the jeweler has alloys that are 25% gold, 50% gold, and 82% gold.

As he wants to make 14 grams of an alloy by adding two different alloys that is precisely 75% gold, so one alloy must have a percentage of gold more than 75%.

One alloy is 82% gold and, the second can be chosen between 25% gold, 50% gold, so there are two cases.

Case 1: 82% gold + 50% gold

Let x grams of 82% gold and y grams of 50% gold added to make x+y=14 grams of 75% gold, so

75% of 14 = 82% of x + 50% of y

$\Rightarrow 75/100 \times 14 = 82/100 \times x + 50/100 \times y \\\\$

$\Rightarrow 75/100 \times 14 = 82/100 \times x + 50/100 \times (14-x)$ [as x+y=14]

$\Rightarrow 75 \times 14 = 82 \times x + 50 \times (14-x) \\\\\Rightarrow 75 \times 14 = 82 \times x + 50 \times14-50\times x \\\\\Rightarrow 75 \times 14 = 32 \times x + 50 \times14 \\\\\Rightarrow 32 \times x =75 \times 14 - 50 \times14 \\\\$

$\Rightarrow x =(25 \times 14)/32=10.9375$ grams

and $y = 14-x= 14-10.9375=3.0625$ grams.

Hence, 10.9375 grams of 82% gold and 3.0625 grams of 50% gold added to make 14 grams of 75% gold.

Case 2: 82% gold + 25% gold

Let x grams of 82% gold and y grams of 25% gold added to make x+y=14 grams of 75% gold, so

75% of 14 = 82% of x + 25% of y

$\Rightarrow 75/100 \times 14 = 82/100 \times x + 25/100 \times y \\\\\Rightarrow 75/100 \times 14 = 82/100 \times x + 25/100 \times (14-x) \\\\ \Rightarrow 75 \times 14 = 82 \times x + 25 \times (14-x) \\\\\Rightarrow 75 \times 14 = 82 \times x + 25 \times14-25\times x \\\\\Rightarrow 75 \times 14 = 57 \times x + 25 \times14 \\\\\Rightarrow 57 \times x =75 \times 14 - 25 \times14 \\\\$