Question

Reduza as equações do 2° grau à sua forma geral (ax² + bx + c = 0)

a) x²+ 20x = x - 9

b) x . ( x + 1 ) + x . ( x + 4 ) = 12

c) 9 + 2x = 5
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x

d) x² + 3x = 1
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2 | 3

Answer 1

a) x²+ 20x = x - 9

x²+19x+9=0

b) x . ( x + 1 ) + x . ( x + 4 ) = 12

2x²+5x-12=0

c) 9 + 2x = 5

4+2x=0

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x  

d) x² + 3x = 1

x²+3x-1=0

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2 | 3