F(x) = 2x2 – x + 9 Find f (4)
1 answer:
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<u>Answer:</u>
square units
<u>Step-by-step explanation:</u>
Knowing the function and that the triangle is formed by both the x and y-axis, you already have the triangle's height, which is 10 (the y-intercept of the functon) To find the base length, all you have to do is find the x-intercept. To do that, simply:
Set function equal to 0 and solve for x:
f(x) = 10 - x
0 = 10 - x
x = 10
x =
This means that the base length of the triangle is also . Now that you have the height and base length, you can
Plug values into the formula for the area of a triangle:
The area of a triangle is × height × base
Height = 10, base =
Area = × 10 ×
Area = 5 ×
Area =