1. SOLVING QUADRATIC EQUATIONS USING THE FORMULA

2. Quadratic equations of the form ax2 + bx + c = 0 can be solved
using the formula:

3. 1 Solve the equation x2 + 2x − 5 = 0.
Give your answers correct to 2 decimal places.
a = b = c = − and or or

4. 2 Solve the equation 3x2 − 8x + 2 = 0.
Give your answers correct to 2 decimal places.
a = b = −8 c = and or or

5. 3 Solve the equation x(x + 1) + (x – 1)(x + 2) = 3.
Give your answers correct to 2 decimal places.
expand the brackets
write in the form ax2 + bx + c = 0
a = b = c = − and or or

6. 4 The area of the rectangle is 30 cm2.
Find the base of the rectangle.
x + 3
expand the brackets and write
in the form ax2 + bx + c = 0 x
a = b = c = − and or
The length of the base must be positive, so x = 4.18 or