Question

Use the quadratic formula to sovle the equation. Round your answer to the nearest tenth.

5x2 + 2x - 9 = 0

Answer 1

what is the quadratic formula?

Answer 2

What is the quadratic formula?

The quadratic formula is used to solve a very specific type of equation, called a quadratic equation. These equations are usually written in the following form:

Ax^2 + Bx + C = 0 @amistre64 right

Answer 3

Example:

Solve this equation for x: x^2 - 4x + 4 = 0

Solution:

What are the three coefficients (a,b,c)? Remember that "a" is the coefficient in front of the x^2 term, b is the coefficient in front of x, and c is that constant at the end.

Therefore, for this equation, a=1, b= -4, and c= 4.

Plug those values into the quadratic formula and solve for x:

Answer 4

@Hero @ParthKohli @paki @Preetha

Answer 5

\[x=\frac{ 4 \pm \sqrt{(-4)^{2} - 4(1)(4)} }{ 2(1) }\]

Answer 6

now you simplify it

Answer 7

that is what the quadratic formula is used for yes :)

Answer 8

oh thx @amistre64

Answer 9

So the answer is 1.2, and -1.6? @amistre64

Answer 10

5x2 + 2x - 9 = 0



-5 +- sqrt(25-4(-9)(5))
---------------------
2(5)


-5 +- sqrt(25+180)
---------------------
10


-5 +- sqrt(205)
---------------
10