If (x+3)(x-9)=0, then the solutions are
a) x=3,9
b) x=-3,9
c) x=0,1
d) x=-3,-9
Solution:(x+3) (x-9) = 0
(x+3)=0, (x-9)= 0
x=-3, x=9
What are the
solutions of the equation
x2+7x – 18=0
a) 2 or -9
b) -2 or 9
c) -2 or - 9
d) 2 or 9
Solution:
x2+ 7x – 18 = 0 x2+9x-2x-18=0
x(x+9)-2(x+9)= 0
(x+9)(x-2)=0
X+9=0, x – 2=0
x=-9, x=2
Which of the following values of x are roots of the equation x2-8x+15=0?
a) x=1 or x=-7
b) x=2 or x=4
c) x=-2 or x=4
d) x=3 or x=5
Solution:x2-8x+15=0?
x2-3x-5x+15= 0 x(x-3)-5(x-3)=0
(x-3)(x-5) =0 x- 3=0 or x – 5=0
x=3 or x=5
