Three fifths of a number y is negative 9. What is the number?
2 answers:
Answer:
The answer is y=-15
Step-by-step explanation:
In order to determine the number, we have to express the problem into an equation. Every time that we want to know a value of a variable, we have to express an equation that it contains the variable.
Let's express every part of the statement:
Three fifths=
A number= y
negative 9= -9
Putting together every part into an equation:
Finally, the value of the number "y" is -15.
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The <em><u>correct answer</u></em> is:
Explanation:
The Quadratic Formula is
,
where a, b and c are the coefficients of a quadratic equation written in standard form, or 0=ax²+bx+c.
This means that first, we need to make our equation equal 0.
We have
-2 = -x + x² - 4
To make this equal 0, we must cancel the -2. We do this by adding 2:
-2+2 = -x + x² - 4 + 2
0 = -x + x² - 2
Now we write this in standard form. This means the x² term must come first, then the x term, then the constant:
0 = x²-x-2
This makes a = 1, b = -1 and c = -2. We then plug this into the quadratic formula.