Verified answer

x+y+ z = -b/a...........z=2y

x+y+2y = 0

x+3y=0

x= -3y >

xy + xz + yz = c/a

-3y.y + -3y.2y + y.2y = -7

-3y² -6y² +2y² = -7

-7y²=-7

y²=1

y= ±1 >

x=-3y= ±3 >

z= 2y = ±2 >

p = x.y.z = ±3. ±1. ±2 = ±6 ☜

q e 2q são as raizes

q+2q = 7

q = 7/3

p = q.2q = 2q² = 2*49/9 = 98/9

98/9

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