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A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.
Given the function f(x) = -2x2 + 4x - 7, find f(-4).
Solution:
A relation f from a set A to a set B is said to be a function if every element of set A has one and only one
image in set B.
In other words, no two distinct elements of B have the same preimage.
The given function is
f(x) = -2x2 + 4x - 7
We have to find f(-4) which means x = -4
Substituting the values
f(-4) = -2 (-4)2 + 4 (-4) - 7
By further calculation
f(-4) = -2 (16) - 16 - 7
f(-4) = -32 - 16 - 7
So we get
f(-4) = -55
Therefore, f(-4) is -55.
Given the function f(x) = -2x2 + 4x - 7, find f(-4).
Summary:
Given the function f(x) = -2x2 + 4x - 7, f(-4) is -55.
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