Math10 week6

(ax+b)(cx+d)=acx^2+(cb+ad)x+bd

 

a        b               cb

c        d               ad

———————————

ac.     bd             cb+ad

 

 

3x^2+8x+5=(x+1)(3x+5)

 

1          1               3

3         5               5

———————————

3         5               8

 

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