Posted: 12/6/2009 8:45:47 PM EDT
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I'm working on some math homework and just need some help with the answers here.
It calls for using the completing the square method for solving these quadratic equations. x^2-2x=24 next one x^2+8x-12=0 next one x^2+5x=4 next x(x-3)=10 last one 4x^2=8x+5 |
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Quoted:
I'm working on some math homework and just need some help with the answers here. It calls for using the completing the square method for solving these quadratic equations. x^2-2x=24 x^2-2x-24=0 (x+4)(x-6)=0 x=-4,x=6 next one x^2+8x-12=0 next one x^2+5x=4 x^2-5x-4=0 next x(x-3)=10 x^2-3x=10 x^2-3x-10=0 (x-5)(x+3)=0 x=5.x=-3 last one 4x^2=8x+5 There are the easy ones. I haven't done any kind of these shenanigans for a while. Basically, you find the multiple of the digit of the number without an x. Then, you add or subtract them to match the x number, not the the x^2. Once you have that figured out, you lay it out like so, (x+y)(x-z). Make each set of numbers in the parenthesis equal zero and solve for x. |
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http://www.purplemath.com/modules/sqrquad.htm This explains the process pretty well. |