Question

The value of f(x) = 5x−4x²+3 when x = -1, is:​

Answer 1

Given

f(x)=5x-4x²+3

To Find

We have to find f(x) at x= -1

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

We have given a function f(x)=5x-4x²+3

Rearranging the terms =>-4x²+5x+3

At x=-1 ,just put the given X's value into the f(x)

Note : Any change in f(x) will cause a change in the function.

at x= -1

=>f(x)=-4x²+5x+3

=>f(-1)=-4(-1)²+5(-1)+3

=>f(-1)= -4-5+3

=>f(-1)=-9+3

=>f(-1)=-6

Therefore ,at x= -1 f(x) is -6

Extra information=>

➥The above function is a quadratic equation as highest power is 2.

➥f(x)=y here ,f is the function and x is an input which gives output say 'y'.

➥We can find infinite number of output of f(x) by putting infinite number of values into f(x).

Answer 2

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