Assuming the formula that was meant was x^2 plus 8x minus 5 equals 0 [ x^2 + 8x - 5 = 0 ]
the quadratic formula uses the standard form of a quadratic ax^2 plus bx plus c = 0 [ax^2 + bx + c = 0] comparing this form to the equation we get
a = 1 b = 8 and c = -5
the quadratic formula is:
x = negative b plus or minus the square root of (b^2 minus 4ac) all over 2a
[ x = (-b +- root(b^2 - 4ac))/2a ]
if we substitute in the values we have for a, b and c we get
x = negative 8 plus or minus the square root of (8^2 minus 4*1*(-5)) all over 2*1
[ x = (-8 +- root(8^2 - 4*1*(-5)))/(2*1) ]
simplified we get
x = (-8 +- root(64 + 20))/2
and
x = (-8 +- root(84))/2
and
x = (-8 +- 2*root(21))/2
we get two solutions
x = (-8 - 2*root(21))/2
x approx= (-8.58)
and
x = (-8 + 2*root(21))/2
x approx= (.58)
To solve for x in the equation x2 - 2x - 2 = 0, use the quadratic equation, that is: For 0 = ax2 + bx + c, the roots (values of x) are defined as: x = [-b +/- sqrt(b2 - 4ac) ] / 2a (If that's hard to understand, google "quadratic formula"). It works out to x = 2.73, -0.73.
If you can't factor it easily, use the quadratic formula.
3x2+x-4 = 0 (3x+4)(x-1) = 0 Solutions: x = 1 and x = -4/3 By using the quadratic equation formula.
Solve by factoring. Solve by taking the square root of both sides.
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Quadratic equation formula
Using the quadratic equation formula:- x = 3.795831523 or x = -5.795831523
The quadratic formula is used to solve the quadratic equation. Many equations in which the variable is squared can be written as a quadratic equation, and then solved with the quadratic formula.
The quadratic formula cannot be used to solve an equation if the coefficient of the equation's x2-term is 0.
By using the quadratic equation formula
The quadratic formula cannot be used to solve an equation if the coefficient of the equation x square term is what?
The quadratic formula can be used to solve an equation only if the highest degree in the equation is 2.
y=b+x+x^2 This is a quadratic equation. The graph is a parabola. The quadratic equation formula or factoring can be used to solve this.
Because it's part of the quadratic equation formula in finding the roots of a quadratic equation.
Using the quadratic equation formula: x = 8.42 or x = -1.42
X= (3/5 , -2)
It can be solved by using the quadratic equation formula.