## Adi3 one year ago will medal How to factor 15x^2 + x – 2

@ganeshie8

@Duck.

@Nnesha

5. Nnesha

AC /headphone method find two numbers when you multiply them you should get product of AC and when you add or subtract them you should get middle term

6. Nnesha

Ax^2+Bx+C a=leading coefficient b=middle term c=constant term

a = 15 b= x c = -2

ac = -30 b = x

9. Nnesha

|dw:1441282946820:dw| multiply 15 times -2

10. Nnesha

b =1 we just need coefficients

okay

12. Nnesha

so what two number would you multiply to get -30 but when you add or subtract them yo get 1

5.6

14. Nnesha

yes right what about signs 5 times 6 =30 but we need negative 30 so which one should be negative 5 or 6 ?

5

-5

17. Nnesha

right so leading coefficient isnn't negative we should apply the grouping method |dw:1441283175163:dw| make a group of 2 terms

18. Nnesha

now find common factor of first and 2nd group look at the drawing what is common in blue box ?

i get it (3x - 1) (5x + 2)

thnxs for helping

21. Nnesha

hm np :=)

ive me a medal

23. Nnesha

i've ? or give ?

give