Answer:
Step-by-step explanation:
When subtracting fractions with the same denominator (bottom number[s]) you can treat the numerators (top number[s]) like subtraction with whole numbers.
is equal to -12. Therefore,
will equal 
. But we're not there yet - this fraction can be simplified. We need to find the GCF, or greatest common factor, of -12 and 9. This would be another number that can be divided evenly into these two numbers. The first possible GCF that comes to mind is 3. Let's test that out:
It works! Now we can use this information to simplify the fraction. We replace -12 with -4 and replace 9 with 3. This gives us our final answer, .
To answer this question you must first plug in the given value for x into your given expression.
Your given x value is a -3.
When plugged in, this leaves you with:
-3^2 + 4(-3) + 3
Next, follow PEMDAS (parenthesis, exponents, multiplication, division, addition, subtraction) to begin to simply your expression.
Start by multiplying the parenthesis, this leaves you with:
-3^2 - 12 + 3
After that, simplify your exponents by squaring the -3. You do this by multiplying it by itself.
This leaves you with:
9 - 12 + 3 (the 9 is positive because the two negative multiplied together cancelled to make a positive)
Finally, simplify across with addition and subtraction to get your final answer.
This results in:
0
So, when x = -3 in this expression, the answer is 0.
I hope this helps! :)
Answer:
Step-by-step explanation:
F(x) = x/ (x^2 + 4x - 21)
F(x)= x / (x - 3)(x + 7)
When x = 3 and x = -7 the denominator is zero so there are no values of the function corresponding to these values of x.
The domain is all Real x except x = -7 and x = 3.
The range is all values of f(x) except for those values when x = -7 and x = 3.
4/5 as a decimal would be 0.8. This is because 5 x 20 = 100, so then if you multiply 5 by 20, then you need to do the same for 4. 4 x 20 = 80. the new fraction is 80/100. Then, that simplifies to 8/10, which is equivalent to eight tenths, which is written as 0.8.
