NEEEED help with 2 and 4?!

Mathematics

1 answer:

muminat2 years ago

8 0

Answer:

ex 2

is d 66 and ex 4 don't know

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What is the axis of symmetry of the function f(x)=-(x+9)(x-21)

Firlakuza [10]

Carry out the mult.: f(x) = -[x^2 - 21x + 9x - 189]

Combine like terms: f(x) = -[x^2 - 12x - 189]
Eliminate the brackets [ ]: f(x) = -x^2 + 12x + 189
Identify coefficients a, b and c: a= -1, b=12, c=189

The equation of the axis of symmetry is x = -b/(2a), which here equals

x = -(12)/[2(-1)], or x = 6

This is also the x-coordinate of the vertex. Plug x=6 into the original equation to calculate the y-coordinate.

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3 years ago

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The sum of three numbers is 3068.Two of the numbers are 1266 and 1755,find the third number<br><br>

ratelena [41]

Answer:

The third number is 47.