Answer:
We start with the equation:
(x^2 - 1)/(x + 1) = 2
We want to rewrite this in standard form.
We can multiply both sides by (x + 1) to get:
((x^2 - 1)/(x + 1))*(x + 1) = 2*(x + 1)
x^2 - 1 = 2*(x + 1) = 2*x + 2
Now we can move all the terms to one side to get:
x^2 - 1 - 2 - 2*x = 0
x^2 - 2*x - 3 = 0
And this is a standard quadratic equation, that we can solve by using the Bhaskara's formula, this will give us the solutions:
Then the two solutions are:
x = (2 + 4)/2 = 3
x = (2 - 4)/2 = -1
Answer:
.9p
Step-by-step explanation:
The discount is the original price times 10%
p* .10= .1p
Subtract this from the original price
p - .10p
.9p
The new price is .9p
Answer:
y=7
Step-by-step explanation:
7y-3y=19+9
4y=28
y=7
Answer:
81.60 is your selling price
Step-by-step explanation:
60% = 0.60
0.60 x 51 = 30.60
51 + 30.60 = 81.60
Answer:
14 3/10
Step-by-step explanation:
5 1/5 * 2 3/4
Change to improper fractions
5 1/5 = (5*5+1) /5 = 26/5
2 3/4 = (4*2+3)/4 = 11/4
26/5 * 11/4 = 286/20
Divide top and bottom by 2
143/10
10 goes into 143 14 times with 3 left over
14 3/10