The book asks to us the quadratic formula to solve for the equation.
Can someone help with these examples:
1.) x^2+4x-2=0
2.) 2x^2 -5x-2=0
3.) x^2+2x=4x
4.) -6x^2 +3x+2=3
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There are more problems but I think I can figure it out once someone helps me with the above examples. Gracias
2 answers
Can someone help me show their work so I can see visual steps to work out these kinds of questions.
think back to algebra I. The QF is
x = [-b +/- sqrt(b^2-4a)]/2a
So, just plug in your number. The first is
x = [-4 +/- sqrt(16-4(1)(-2)]/2
= [-4 +/- sqrt(16+8)]/2
= -4 +/- sqrt(24)]/2
= -2 +/- sqrt(6)
Do the same with the others. First step is to get everything on the left side so you can see what a,b,c are.
x = [-b +/- sqrt(b^2-4a)]/2a
So, just plug in your number. The first is
x = [-4 +/- sqrt(16-4(1)(-2)]/2
= [-4 +/- sqrt(16+8)]/2
= -4 +/- sqrt(24)]/2
= -2 +/- sqrt(6)
Do the same with the others. First step is to get everything on the left side so you can see what a,b,c are.
0 answers