Question

represente na forma reduzida
$(x - 5) \times (x - 4)$


$(x - {1})^{2} + (x + {1})^{2} = 20$

$3.(x - {2})^{2} = 12 - x$
Me ajuda pfv
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Answer 1

Explicação passo-a-passo:

x2-4x-5x+20

x2-9x+20=0

delta=(-9)2-4.1.20

delta=81-80

delta=1

x'=9+1/2

x'=10/2

x'=5

x"=9-1/2

x"=8/2

x"=4

x2-2.x.1+1+x2+2.x.1+1=20

2x2=20-2

2x2=18

x2=18/2

x=raiz de 9

x=3

3.(x2-4x+4)=12-x

3x2-12x+12=12-x

3x2-11x=0

delta=(-11)2-4.3.0

delta=121

x'=11+11/6

x'=11/3

x"=0