Answer:
d
Step-by-step explanation:
Given y is directly proportional to x² then the equation relating them is
y = kx² ← k is the constant of proportion
To find k use the condition y =  when x =
 when x =  , then
, then
 = k(
 = k( )² =
 )² =  k ( multiply both sides by 8 )
 k ( multiply both sides by 8 )
1 = 2k ( divide both sides by 2 )
k = 
y =  x² ← equation of proportion
 x² ← equation of proportion
When y =  , then
 , then
 =
 =  x² ( multiply both sides by 2 )
 x² ( multiply both sides by 2 )
9 = x² ( take the square root of both sides )
x = ±  = ± 3
 = ± 3
with positive value x = 3 → d
 
        
             
        
        
        
f(x)g(x) = 9x² + 10x - 16
<u>Step-by-step explanation:</u>
Step 1: 
Given f(x) = 3x - 4 × 2 + 6x and g(x) = 5x + 2 × 2 - 3x
f(x) = 9x - 8
g(x) = 2x + 4
f(x)g(x) = (9x - 8)(2x + 4) 
= 18x² + 36x - 16x -32 
= 18x² + 20x - 32
= 9x² + 10x - 16
 
        
             
        
        
        
Here's the answer 
432=2^4 x 17
        
             
        
        
        
The answer to the solution is X+3<19-x.