Solving quadratics
What is x:
(x-2)(x-3)=0
x = 2 and x = 3
What goes in the gap?
(x+2)(x+4)=x^2 +6x+?
8
What goes in the gap?
x^2+5x+6=(x+2)(x+?)
3
What is x?
(x-2)(x-5)=0
x = 2 and x = 5
What is x:
(x+4)(x-5)=0
x = -4 and x = 5
What goes in the gap?
(x+3)(x+4)=x^2+?+12
7x
What goes in the gap?
x^2 +10x+16=(x+2)(x+?)
8
What goes in the gap?
(x-3)(x+5)=x^2+?-15
2x
What is x:
(x+6)(x+10)=0
x = -6 and x = -10
Expand the brackets:
(x+1)(x+4)
x^2+5x+4
Factorise:
x^2+9x+18
(x+3)(x+6)
Factorise:
x^2 +4x+4
(x+2)(x+2)
(x+2)^2
What is x
(2x-5)(x+3)=0
x = 2.5 and x = -3
Expand the brackets
(x+7)(x-3)
x^2+4x-21
Factorise:
x^2+2x-24
(x+6)(x-4)
Expand the brackets:
(x-3)(x+3)
x^2-9
What is x:
x^2+8x+15=0
x = -3 and x = -5
Expand the brackets:
(2x-5)(x+3)
2x^2 +x-15
Factorise:
x^2-x-20
(x-5)(x+4)
Factorise:
9x^2 -4
(3x+2)(3x-2)