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The quadratic expression (x+4)(x-8) is written in factored term. A. Write the expression in standard form ax^2+bx+c 

b. Write the expression in vertex form a(x-h)^2+k

 Apr 6, 2020
 #1
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a.   standard  form

 

(x + 4)  ( x - 8)     expand

 

x^2  +  4x  -  8x  - 32

 

x^2   -  4x   - 32

 

 

b. vertex  form

 

complete the  square  on x

 

x^2  - 4x +  4  -  32  +  4       factor  the  first three terms and simplify

 

( x - 2)^2   -  28

 

 

 

cool cool cool

 Apr 6, 2020

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