Which expression is equivalent to the area of metal sheet required to make this square-shaped traffic sign? A square shaped traf
2 answers:
Answer:
A:
Step-by-step explanation:
We are given that a metal sheet which is required to make square -shaped traffic sign.
We are given that a square shaped traffic sign is shown with length of on side labeled as x+1.
We have to find an expression which is equivalent to area of metal sheet used in square shaped traffic sign
Length of square shaped traffic sign=
We know that area of square =
Therefore, area of metal sheet used in square shaped traffic sign=
Hence, option A is true.
Answer : A:
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Answer:
y= -2x²+4x.
Step-by-step explanation:
the common equation of the parabola is y=ax²+bx+c, where a, b, c - numbers.
1) the coordinates of the vertex are:
2) if according to the condition x₀=1, then b= -2a.
If according to the condition y₀=2, then
it means that c=a+2.
3) if b= -2a; c=a+2 and the point (3;-6) belongs to the given parabola, then it is possible to substitute them into the common equation of the parabola:
-6=3²*a-6a+a+2; ⇔ a= -2.
4) if a= -2, then b=-2a=4, and c=a+2=0.
5) if a=-2, b=4 and c=0, then the required equation of the parabola is:
y= -2x²+4x.