Quadratic Equation by Quadratic Formula

Quadratic Equation by Quadratic Formula

by YN AU

Multiple Choice

Solve $$x^2+3x-10=0$$  

• x=5 or x=-2

• x=5 or x=2

• x=-5 or x=-2

• x=-5 or x=2

Quadratic Equation

​Rewrite the equation as

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Multiple Choice

$$2x^2+3x-7=0$$

$$b^2-4ac=$$  

• -47

• 37

• 65

• 25

Multiple Choice

$$2x^2+3x-7=0$$

$$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}=$$  

• $$x=\frac{3\pm\sqrt{65}}{2}$$  

• $$x=\frac{3\pm\sqrt{65}}{4}$$  

• $$x=\frac{-3\pm\sqrt{65}}{4}$$  

• $$x=\frac{-3\pm\sqrt{-47}}{4}$$  

Multiple Choice

Solve $$x^2+4x-3=0$$  

• x=0.65 or x=-4.65 (2 d.p.)

• x=-0.65 or x=4.65 (2 d.p.)

• x=-3 or x=-1

• x=3 or x=1

Multiple Choice

Solve  $$2x^2-3x-6=0$$  

• x=-2.64 or x=1.14

• x=2.64 or x=-1.14

• No real solutions

• x=2.31 or x=-0.81

Multiple Choice

Solve $$x(x+4)=6x+11.$$  .

• $$x=1\pm2\sqrt{3}$$  

• $$x=-1\pm2\sqrt{3}$$  

• $$x=1\pm2\sqrt{10}$$  

• $$x=\frac{1\pm\sqrt{48}}{2}$$