Answer:
(n -7)(4n + 8) = 0
Step-by-step explanation:
(a -b)² = a² - 2ab + b²
(2n - 5)² = 81
(2n)² - 2*2n*5 + 5² = 81
4n² - 20n + 25 = 81
4n² - 20n + 25 - 81 = 0
4n² - 20n - 56 = 0
4n² - 28n + 8n - 8*7 = 0
4n*(n -7) + 8*(n - 7) = 0
(n -7)(4n + 8) = 0
Answer: i dont understand the question
Step-by-step explanation:
7, 0, -2. i think this is right
Let
Eqn 1 be <span>8x = 2y + 5
</span><span>
And,
</span><span>3x = y + 7
</span>therefore
Eqn 2 is <span> x= 1/3(y+7)
</span>
Sub 2 into 1 gives:
8(1/3(y+7)) = 2y + 5
8/3(y) + 56/3 = 2y + 5
2/3(y) = –41/3
2y=–41
y= –41/2
X= –9/2.
Therefore, <span>{(-9/2, -41/2)} is your solution set. As the notation is equal to (x,y)</span>