Question

Write p(x) = 21 + 24x + 6x2 in vertex form. p(x) =___ (x +__ )2 – ___

Answer 1

Answer:

6,2,3

Step-by-step explanation:

Answer 2

Vertex form is $p(x)=a(x-h)^2+k$basically, just complete the square on the right side
$p(x)=6x^2+24x+21$group x terms together
$p(x)=(6x^2+24x)+21$
factor out linear coefient (number in front of the higest power x, in this case x^2)
$p(x)=6(x^2+4x)+21$
take 1/2 of the linear coefient and square it (4 is linear coefient so take 1/2 of it and square it (4/2=4, 4^2=4)), add positive and negative of it inside the parenthaees (so it equals 0)
$p(x)=6(x^2+4x+4-4)+21$
factor perfect square trinomial$p(x)=6((x+2)^2-4)+21$
distribute (don't distribute or expand the squared term)$p(x)=6(x+2)^2-24+21$
$p(x)=6(x+2)^2-3$