Question

pls answer these....

Answer 1

f) 5x^2+x-4=0

5x^2+5x-4x-4=0

5x(x+1) -4(x+1)=0

(5x-4) (x+1)=0

x=4/5 or x=-1

Answer 2

a) 4x-1.2=3x -0.6

x=0.6

b)5x²+x-4=o

5x²+5x-4x-4=0

5x(x+1)-4(x+1)=0

(5x-4)(x+1)=0

so x=4/5 and -1

c)(x+2)(x-3)=14

x²-3x+2x-6=14

x²-x-20=0

x²-5x+4x-20=0

x(x-5)+4(x-5)

x= - 4 and 5

d)(x-5)²=81

(x-5)=9

x=14

e) 3(x-5)-2=7-(1-x)

3x-15-2=7-1+x

2x=23

x=23/2