Solve the following equation: x^2 - 11x + 18 = 0

Use the factorisation method.

Step 1: Rewrite (x + __ )(x + __ ) = 0

Step 2: We need to fill in the blanks. The numbers we require are -2 and -9.

Step 3: We need the values of x, so that when the brackets are multiplied together, the answer is zero.

So, x = 2 or x= 9.

Step 4: Substitute in the values of x into the original quadratic and check you have the right answer. You should get zero both times.

TD

Related Maths GCSE answers

All answers ▸

Solve the quadratic equation (x^2)-x-12=0 (easy), (x^2)-9=0 (special case), (x^2)+5x-13=0 (quadratic formula)


How to find LCM and HCF of two numbers


Solve this simultaneous equation: 5x+6y=3 and 2x-3y=12.


Expand and simplify (x-2)(2x+3)(x+1)