When completing the square, what value must you add to both sides of the equation to create a perfect square trinomial?
1 answer:
Notice that half of the coefficient of x is (1/2)(-4), or -2.
Then x^2 - 4x becomes
x^2 - 4x + 4 - 4 = 0, or (x -2)^2 = 4. Then x = -2 plus or minus 2, and the two roots are 0 and -4.
Thus, add 4 to both sides to obtain x^2 - 4x + 4 = 4.
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Answer:
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Answer:
f(x) = (x - 1)2
f(x) = 2x - 2
let x = -5, f(x) = -12
let x = 0, f(x) = -2
let x = 5, f(x) = 8
range is {-12, -2, 8}
