SOLUTION: Use the quadratic formula to solve the following equation for x, show as much work as possible: 0 = 2x2 - 5x - 18.
Algebra.Com
Question 410986: Use the quadratic formula to solve the following equation for x, show as much work as possible: 0 = 2x2 - 5x - 18.
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
Please use the "^" symbol (SHIFT+6) to indicate exponents. "2x2" could be interpreted as 2 times x times 2.
The general quadratic equation is:
You must learn this because the Quadratic Formula:
is written in terms of the a, b and c from the genreal equation.
With your equation
a = 2
b = -5
c = -18
(If you don't see why b and c are negative, then look at the general equation. It is written with additions. So you have to write (ar least think of) your equation with additions:
Now we just substitute these values into the formula and simplify:
which simplifies as follows:
Quadratic equations have two solutions. The "plus or minus" symbol in the formula is a shorthand way of expressing both solutions within the same expression. It is now time to write the two solutions separately. This last expression is a shorthand way of saying:
or
We can now continue with the simplifying:
or
or
RELATED QUESTIONS
Use the Quadratic Formula to solve the equation.
-2x2 - 5x + 5 =... (answered by unlockmath)
Use the Quadratic Formula to solve the equation.
-2x2 - 5x + 5 =... (answered by jim_thompson5910)
I am helping my son with his homework and i need answers to problems to confirm they are... (answered by stanbon)
Use the Quadratic Formula to solve the equation. (Enter your answers as a comma-separated (answered by Alan3354)
Use the quadratic formula to solve each of the following quadratic equations.
2x2 - 5x (answered by jim_thompson5910)
x^2 + 3x - 18 = 0
Use the following quadratic equation to complete parts a and b... (answered by awang1996)
Use the following quadratic equation to answer questions a and b below. must show all... (answered by Fombitz)
Solve by applying the Quadratic Formula; all radicals should be simplified as far as... (answered by checkley77)
Solve by applying the Quadratic Formula; all radicals should be simplified as far as... (answered by checkley77)