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15.
x=3
x2 + 3x - 15 = 0 you need to use the quadratic equation... since you have x to the second degree you will get two answers... yours two answers are... x = 2.6533 and -5.6533
if you want to "solve" this equation, you need an equals sign somehwere! For example, if the problem was 2x - 52=5 then you could solve. You add 52 (or 25) to both sides so the equation becomes 2x = 30. Then you divide both sides by 2 to get x=15
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