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Anonymous
x2+3x = 7
x2+3x-7 = 0
Using the quadratic equation formula:-
x = -4.541381265 or x = 1.541381265
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3x(2x + 1)
It is a quadratic equation.
y = 3x + 21x2 = 3x(1 + 7x)
It is: 3x2+6x-11 = 0
Yes.