Question

15b^2 - 19b -10
factor by grouping

Answer 1

(3b-5) (5b+2)

Answer 2

we have Ab^2+Bb+C
find two factors of A*C that multiply to be A*C and add up to be B

A*C=15*(-10)=5(-30)=75(-2)=25(-6)=-25(6)

B=-19=-25+6

so replace Bb=-19b with -25b+6b

so we have 15b^2-25b+6b-10

now factor by grouping

5b(3b-5)+2(3b-5)

(3b-5)(5b+2)

Answer 3

thank you guys! sorry it took so long to respond.