Consider the function f(x) = -4x²-9x+20. Determine f(-2)=

Mathematics

1 answer:

hoa [83]2 years ago

3 0

Step-by-step explanation:

you just substitute (-2) into the x values of the above function

$f( - 2) = - 4( - 2)^{2} - 9( - 2) + 20 \\ f( - 2) = 22$

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Write an algebraic expression that represents 2 less than 18 times a number?<br>

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Answer:

Step-by-step explanation:

18x-2

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mart [117]

125% because sixteen is equal to a whole which is equal to one-hundered and one fourth of sixteen is four and sixteen plus four is twenty. one fourth of one-hundered is twenty-five so you add the twenty-five to the one-hundered and you get 125%

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The area of a triangle is 20 cm², and the

grandymaker [24]

Answer:

Heavenly, we need the forumula for the area of a triangle, do you know it?

Step-by-step explanation:

Area of a triangle is (1/2 ) * B*H

where B = base

H = height

then

A = 1/2* B * H

A is given to be 20

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plug all those into the formula,

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use your algebra skillz :P

20 = 1/2 *( $b^{2}$ + 4b)

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rewrite the above so it's in x format

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use the quadratic formula to find x , and for our problem, remember that x represents the base, or b, but don't mix it up with the b in the quadatic fomula, with the b of the triangle, which is the base, they are differnt "b"s :P

X = (b± $\sqrt{b^{2}-4*a*c }$ ) / 2*a