Find f(4),f(-5),f (3.2) if f (x) = 6.2x2 – 4x3 + 4.28 …………�

1.	Find f(4),f(-5),f (3.2) if f (x) = 6.2x2 – 4x3 + 4.28 ……………… A) f(4) = -152.53, f(-5) = 659.28, f(3.2) = 63.304 B) f(4) = -152.52, f(-5) = -659.28, f(3.2) = 63.304 C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304 D) f(4) = -152.52, f(-5) = 659.27, f(3.2) = -63.304
Answer» Correct option is (C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304 \(\because f(x)=6.2x^2-4x^3+4.28\) \(f(4)=6.2\times4^2-4\times4^3+4.28\) = 99.2 - 256 + 4.28 = 103.48 - 256.00 = -152.52 \(f(-5)=6.2\times(-5)^2-4(-5)^3+4.28\) = 155 + 500 + 4.28 = 659.28 \(f(3.2)=6.2\times(3.2)^2-4(3.2)^3+4.28\) = 63.488 - 131.072 + 4.28 = - 63.304 C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304

Find f(4),f(-5),f (3.2) if f (x) = 6.2x2 – 4x3 + 4.28 ……………… A) f(4) = -152.53, f(-5) = 659.28, f(3.2) = 63.304 B) f(4) = -152.52, f(-5) = -659.28, f(3.2) = 63.304 C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304 D) f(4) = -152.52, f(-5) = 659.27, f(3.2) = -63.304

Answer»

Correct option is (C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304

\(\because f(x)=6.2x^2-4x^3+4.28\)

\(f(4)=6.2\times4^2-4\times4^3+4.28\)

= 99.2 - 256 + 4.28

= 103.48 - 256.00

= -152.52

\(f(-5)=6.2\times(-5)^2-4(-5)^3+4.28\)

= 155 + 500 + 4.28

= 659.28

\(f(3.2)=6.2\times(3.2)^2-4(3.2)^3+4.28\)

= 63.488 - 131.072 + 4.28

= - 63.304

C) f(4) = -152.52, f(-5) = 659.28, f(3.2) = -63.304