Question

b)(4x-1) (x-6)= c)(-8a+9) (a+10)= d)(-3a-4) (-2a-7)=

Answer 1

b)(4x-1) (x-6)=0

4x^2-24x-x+6=0

4x^2-25x+6=0

/\=625-96

√/\=23

x1=25-23/8=1/4

x2=25+23/8=48/8=6

c)(-8a+9) (a+10)=0

-8a^2-80a+9a+90=0

-8a^2-71a+90=0

/\=5041+2880

√/\=89

x1=71-79/-16=-/16

x2=71+79/-16=-150/16

d)(-3a-4) (-2a-7)=0

-6a^2+8a+21a+28=0

-6a^2+29a+28=0

/\=841-672

√/\=13

x1=-29-13/-12=16/12

x2=29+13/-12=-3.5