Please help me with this math!?

2016-11-14 3:19 pm

Which of the following quadratics in intercept form, is the same function as f(x)=2^2-4x-6?
A.f(x)=(2x+1)(x+3)
B.f(x)=2x(x-1)(x+3)
C.f(x)=2x(x+1)(x-3)
D.f(x)=-2x(x-1)(x+3)

Which of the following parabolas has the lowest minimum value?
Parabola 1:g(x)=x^2-4x
Parabola 2:f(x)=2(x+1)^2

A.They both have the same minimum value.
B.Parabola 1
C.Parabola 2
D.Neither. Both parabolas have maximum values.

What are the x intercepts of f(x)-5x^2+6x+9? (State your answers in ordered pairs. Round to 2 decimal places.)

回答 (2)

Pinkgreen

2016-11-14 4:43 pm

Mistake: there is no the lowest minimum, but only one minimum. Check your
problem.

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DWRead

2016-11-14 3:22 pm

g(x) = x² - 4x
= x² - 4x + 2² - 2²
= (x-2)² - 4
vertex: (2,-4)

f(x) = 2(x+1)²
vertex: (-1,0)

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