F(x)=4x>2+12x+9 Rewrite to function by completing the square F(x)=...(x+)>2+...

f(x) = 4( x + 3/2)^2

Step-by-step explanation:

F(x) =4 x^2 + 12x + 9

= 4 [ x^2 + 3x] + 9

Add (3/2)^2 - (3/2)^2 to the square bracket, we have:

4 [ x^2 + 3x+ (3/2)^2 - (3/2)^2] + 9

4[ (x + 3/2 )^2 - 9/4] + 9

4( x + 3/2)^2 - 9/4 ×4 + 9

4( x + 3/2)^2 - 9 + 9

4( x + 3/2)^2 +0

4( x + 3/2)^2

Note the (3/2)^2 - (3/2)^2 is decoded by dividing b by 2 and squaring it and then subtracting same. Look at the general equation of a circle given below

ax^2 + bx + c

To form a square expression we adopt (b/2)^2 - (b/2)^2 to the general equation provided a = 1;

To make a = 1; we had to factor out 4 from the coefficient of x; making perfect square is of concern when we have ax^2 + bx ; irrespective of 'c' or not.

This is usually referred to as method of completing the square in solving quadratic equation

$30.32

step-by-step explanation:

65.00*.12=2.80

65.00-2.80=57.20

57.20*1.06=60.632

60.632/2=30.316