Which expression gives the solutions of -5+2x^2=-6x
-5 + 2x² = -6x
rearrange the equation to the form ax² + bx + c = 0
=> 2x² + 6x - 5
use the quadratic formula to solve for the value(s) of x \(-b ± \sqrt{ \frac{b^{2} - 4ac}{2a} }\)
=> \(-6 ± \sqrt{ \frac{6^{2} - 4(2)(-5)}{2(2)} }\)
=> \(-6 ± \sqrt{ \frac{36 - (-40)}{4} }\)
=> \(-6 ± \sqrt{ \frac{76}{4} }\)
∴ x = \(-6 + \sqrt{ 19} }\) OR x = \(-6 - \sqrt{19}\)
x = - 1.64 ; x = - 10.36
Answer:
The solutions are
\(x1=\frac{-6+2\sqrt{19}}{4}\)
\(x2=\frac{-6-2\sqrt{19}} {4}\)
Step-by-step explanation:
we have
\(-5+2x^{2} =-6x\)
rewrite the quadratic equation
\(2x^{2}+6x-5=0\)
The formula to solve a quadratic equation of the form \(ax^{2} +bx+c=0\) is equal to
\(x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}\)
in this problem we have
\(2x^{2}+6x-5=0\)
so
\(a=2\\b=6\\c=-5\)
substitute in the formula
\(x=\frac{-6(+/-)\sqrt{6^{2}-4(2)(-5)}} {2(2)}\)
\(x=\frac{-6(+/-)\sqrt{76}} {4}\)
\(x=\frac{-6(+/-)2\sqrt{19}} {4}\)
\(x1=\frac{-6+2\sqrt{19}}{4}\)
\(x2=\frac{-6-2\sqrt{19}} {4}\)