Solving Quadratics

An equation whose roots are 3 & -7 is

• x²+4x-21 =0

• x²+4x+21 =0

• x² -4x-21 =0

• x²+4x+21 =0

Which equation has two equal roots?

• x²+8x-16 =0

• x²+6x+9 =0

• x² -10x-25 =0

• x²-9x+9 =0

Which of the following are the roots of the equation

x²+11x = -10

• -1 and -10

• -1 and 10

• 1 and -10

• 1 and 10

Which of the following is not a quadratic Equation

• x²+10x +20 =0

• 10x +16 = 0

• 3x²+21x = 30

• x² = -8x -16

If one root of the equation x²+6x +c =0 is -4, find the value of c

• -16

• -8

• 8

• 16

Solve for x²-7x-18 = 0

• x=9 and x=2

• x= -9 and x= 2

• x=9 and x= -2

• x= -9 and x =-2

Solve 3x²- 15x =42

• x = 0 and x= 7

• x= 2 and x= 7

• x= -7 and x= -2

• x= 7 and x= -2

Solve 4x² =20x

• x= 5 and x=4

• x= -5 and x= 0

• x= 5 and x =0

• x= 4 and x =-5

Solve 5x²= 80

• x= 4 and x= 0

• x= 4

• x= -4 and x= 0

• x= -4 and x =4

Solve -6x + 8 = -x²

• x= 4 and x= 2

• x= -4 and x= -2

• x= 4 and x= -2

• x= -4 and x=2