Question

The value of 5x2 - 11x + 18 is when x = 2.4 and whenx = -3.

Answer 1

Answer:

20.4

96

Step-by-step explanation:

The value of 5x² - 11x + 18 is

5(2.4)²-11(2.4) +18 = 5(5.76) -26.4+18

= 28.8 -26.4+18 = 20.4 (when x = 2.4)

and 5(-3)² -11(-3) +18 = 45+33+18 = 96

(when x = -3)

Answer 2

f(x)=5x^2-11x+18

$\\ \sf\longmapsto f(2.4)$

$\\ \sf\longmapsto 5(2.4)^2-11(2.4)+18$

$\\ \sf\longmapsto 5(5.76)-26.4+18$

$\\ \sf\longmapsto 28.8-26.4+18$

$\\ \sf\longmapsto 2.4+18$

$\\ \sf\longmapsto 20.4$

And

$\\ \sf\longmapsto f(-3)$

$\\ \sf\longmapsto 5(-3)^2-11(-3)+18$

$\\ \sf\longmapsto 5(9)+33+18$

$\\ \sf\longmapsto 45+51$

$\\ \sf\longmapsto 96$