如何求函数的最值?
1个回答
2023-02-04
展开全部
ax^2+bx+c=0 => x^2+(b/a)x+(c/a)x = 0
=>(x+b/2a)^2=b^2/[4(a^2)]-c/a
=>(x+b/2a)^2=(b^2-4ac)/4a^2
=>x+b/2a = [sqrt(b^2-4ac)]/2a
=>x=[-b±√(b^2-4ac)]/2a
=>(x+b/2a)^2=b^2/[4(a^2)]-c/a
=>(x+b/2a)^2=(b^2-4ac)/4a^2
=>x+b/2a = [sqrt(b^2-4ac)]/2a
=>x=[-b±√(b^2-4ac)]/2a
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