## dietrich_harmon 3 years ago What is the factored form of the equation? Factor completely. 24q7 – 42q4r + 36q3r2 – 63r3

1. dietrich_harmon

@Callisto

2. dietrich_harmon

@Lilith

3. Lilith

the two middle terms are q^4r and q^3r^2. notice q^3*q^4=q^7 (the first term) and r*r^2=r^3 (the last term)

4. Lilith

so we have (a*q^3-b*r)(c*q^4+d*r^2)

5. Lilith

6. Lilith

7. Lilith

for ac and ad (24 & 36) the common factor is 12. this means a must equal 12. so c must equal 2 (12*2=a*c=24) and d must equal 3 (12*3=a*d=36)

8. Lilith

bc and bd have a common factor of 21. this must be b. we can check this. 21*2=b*c=42; 21*3=b*d=63 so a=12; b=21; c=2; d=3;

9. Lilith

we can finish the factoring now. \[(aq^3−br)(cq^4+dr^2)=acq^7−bcq^4r+adq^3r^2−bdr^3\] \[(12q^3−21r)(2q^4+3r^2)=24q^7−36q^4r+42q^3r^2−63r^3\]

10. Lilith

for the first factor \[(12q^3-21r)\] a "3" can be factored out. \[(12q^3-21r)=3(4q^3-21r)\] so our final factorization is \[3(4q^3-21r)(2q^4+3r^2)\]

11. Lilith

that should be\[3(4q^3−7r)(2q^4+3r^2)\]