What is the value of the expression below when x = 4 2x² + x – 5
1 answer:
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Answer:
B
Step-by-step explanation:
The red graph is a reflection of the black graph in the x- axis followed by a horizontal translation to the left of 5 units
Under a reflection in the x- axis
a point (x, y) → (x, - y )
Note the y- coordinates are the negative of each other and
= - y
Given f(x) then f(x + a) is a horizontal translation of f(x)
• If a > 0 then a shift to the left of a units
• If a < 0 then a shift to the right of a units
Here the shift is to the left, thus
f(x) → f(x + 5) and
The equation of the red graph is
= f(x + 5) → B