Let the width of the rectangle be x Then length =x-4 Area=x(x-4)=140 x²-4x=140 x²-4x-140=0 x²-14x+10x-140=0 x(x-14)+10(x-14)=0 (x-14)(x+10)=0 Therefore,length=14 cm and width=10 cm
Let’s make an equation Let’s say x = amount of years after Smith = 8, mother = 42 3(8 + x) = 42 + x 24 + 3x = 42 + x 2x = 18, x = 9 Solution: after 9 years
