First four terms are 7, -13, 67, -253
<em><u>Solution:</u></em>
Given that,
<em><u>The formula to find nth term is given as:</u></em>
We can find the first four terms by substituting n = 2, 3, 4
<em><u>First term:</u></em>
f(1) = 7
<em><u>Second term:</u></em>
Substitute n = 2
<em><u>Third term:</u></em>
Substitute n = 3
<em><u>Fourth term:</u></em>
Substitute n = 4
Thus first four terms are 7, -13, 67, -253
(3w+6)-(2w+4)= w+2
Hope this helps
3.100 I think if I am correct
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Step-by-step explanation:
Elimination method is my favorite way to solve 2 equations like this written in standard form! First I'm going to rewrite the equations and mark numbers to make this explanation more clear.
2x-3y=251️⃣
5x+3y=102️⃣
Looking at these 2 equations we can see that there is a +3 and a -3. This could be eliminated by adding the 2 equations together! *Remember what is on the left side adds with the left side, and what's on the right side adds with the right side. Therefore we can do:
1️⃣+2️⃣
2x-3y+5x+3y=25+10
7x=35
x=5
Then we can substitute the value of x back into either of the 2 equations.
2*5-3y=25
10-3y=25
3y=-15
y=-5
Then write the 2 answers together.
{x=5
{
{y=-5
Now we can check our answers.
2*5-3*-5=10- -15= 10+15=25 Correct
5*5+3*-5= 25+ -15= 10 Correct
From this we can see that x=5 y= - 5 are the correct answers!
