Ax^2+bx=c
REMEMBER THIS
ok
first, make sure that a is 1
done
now take 1/2 of b and square it
-18/2=-9, (-9)^2=81
add that to both sides
x²-18x+81=19+81
x²-18x+81=99
factor perfect square
(x-9)²=100
square root both sides
don't forget positive and negative root
x-9=10
x-9=-10
ad 9 to both sides
x=19
x=-1
answer is -1; 19
2nd choice is answer
Answer:
14
Step-by-step explanation:
Replace each instance of x with 0 to find f(0):
f(0) = (3/2)(0) + 14 = 14
So, x^2 + 14 x + 49 - 4 = 0;
Then, we use the formula ( a + b )^2 = a^2 + 2ab + b^2;
We have ( x + 7 )^2 - 2^2 = 0;
Then, ( x + 7 )^2 - 2^2 = 0;
We use the formula a^2 - b^2 = ( a - b)( a + b );
We obtain ( x + 5 )( x + 9) = 0;
Then, x + 5 = 0;
x = -5;
x + 9 = 0;
x = - 9;
-5 and - 9 are the zeros of the quadratic function.