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2015-02-27T21:01:29+08:00
X2+6x=-5
x2+6x+5=0
(x+5)(x+1)=0
x=-5 atau x=-1

3m2=8m-4
3m2-8m+4=0
(3m+2)(m+2)=0
m=-2/3 atau m=-2

2y2=5y+63
2y2-5y-63=0
(2y+9)(y-7)=0
y=-9/2 atau y=7
2015-02-28T15:42:02+08:00
X² + 6x = -5
x² + 6x + 5 = 0
(x+5)(x+1) = 0
x₁ = -5
x₂ = -1

3m² = 8m - 4
3m² - 8m + 4 = 0
(3m-2)(m-2) = 0
m₁ = 2/3
m₂ = 2

2y² = 5y + 63
2y² - 5y - 63 = 0
(2y+9)(y-7) = 0
y₁ = 9/2
y₂ = 7