Question

给二次函数配方、找出定点坐标y=x.x+3x-2步骤该怎么写呢

Answer 1

y=x^2+3x-2

=(x^2+2*1.5x+(1.5)^2)-1.5^2-2

=(x+1.5)^2-2.25-2

=(x+1.5)^2-4.25

顶点坐标就是（-1.5,-4.25）