Question

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Answer 1

7)

1-

y=x²+5x=ax²+bx+c

a=1

b=5

c=0

letra B

2-

y=-2x²+8x-6

xv=-b/2a=-8/(-4)=2

yv=-2*2²+8*2-6= -8+16-6=2

(2,2)

Letra D

3-

L(x)=V(x)-C(x)

L(x)=3x²-12x-(5x²-40x-40)

L(x)=-2x²+28x+40

xv=-b/2a=-28/(-4)=7

letra D

4)

180 -----------pi

225------------x

180x=225pi

x=225pi/180

x=(45/36) pi

x=(5/4) pi

Letra C