Sendo A=3x² + 5x -6 determine o valor de A para
A)x=-2 B)x=2⁻¹
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A)x=-2
3(-2)²+5(-2)-6=
3.4-10-6=
12-10-6=
2-6=
-4
B)x=2^-1
x=1/2
3(1/2)²+5(1/2)-6=
3(1/4)+5/2-6=
3/4+5/2-6=
3/4+10/4-24/4=
13/4-24/4=
-11/4
3(-2)²+5(-2)-6=
3.4-10-6=
12-10-6=
2-6=
-4
B)x=2^-1
x=1/2
3(1/2)²+5(1/2)-6=
3(1/4)+5/2-6=
3/4+5/2-6=
3/4+10/4-24/4=
13/4-24/4=
-11/4
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