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Subtract 9 from each side: 4x2 + 4x - 8 = 0

Simplify: 4(x2 + x - 2) = 0

Factorise: 4(x + 2)(x - 1) = 0

So x = -2 or 1 both of which satisfy the original equation.

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Q: How do you answer 4x2 plus 4x plus 1 equals 9?
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