If the roots of a quadratic equation are –4 and 2, the equation is equivalent to (x + 4)(x – 2) = 0
(x – 4)(x + 2) = 0
(x + 4)(x + 2) = 0
(x – 4)(x – 2) = 0
If the roots of a quadratic equation are –4 and 2, the equation is equivalent to?
2015-05-07 12:04 am
回答 (3)
2015-05-07 12:14 am
(x+4)(x-2)=0
the roots are always the opposite of the numbers in the brackets
the roots are always the opposite of the numbers in the brackets
2015-05-07 12:12 am
(x + 4)(x – 2) = 0
2015-05-07 12:10 am
(x + 4)(x - 2) = 0, because the roots always take the opposite sign from the equation.
x + 4 = 0 (subtract four from each side)
x = -4
x - 2 = 0 (add two to each side)
x = 2
x + 4 = 0 (subtract four from each side)
x = -4
x - 2 = 0 (add two to each side)
x = 2
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