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OpenStudy (vanz):
how do you solve this x2 + 3x - 9 = 0 ?
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hero (hero):
You have to complete the square
OpenStudy (vanz):
i did, but i want to check my answer :)
OpenStudy (pokemon23):
Hero good news the test was easier than I thought If I pass I go to a regular math class :)
hero (hero):
x^2 + 3x = 9 x^2 + 3x + (3/2)^2= 36/4 + 9/4 (x+3/2)^2 = 45/4 x + 3/2 = +/- sqrt{45}/2 x = +/-3sqrt{5}/2 - 3/2 x = (+/- 3sqrt{5} - 3)/2
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