X = 7
5 + x can also be written as 5 + 7
5 + 7 = 12
The answer is, C
2x +3y=7.20
4x+2y=8.80
C, because the graph titles.
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Answer:
x^2 -4x +2 = 0
Step-by-step explanation:
The other root is the conjugate of the given one, so is 2-√2. The quadratic equation in factored form is then ...
(x -2-√2)(x -2+√2) = 0
Expanding this, we get ...
(x -2)^2 -(√2)^2 = 0
x^2 -4x +4 -2 = 0
x^2 -4x +2 = 0 . . . . the equation you're looking for