Factorise and solve x2 - 8x + 15 = 0
Factorise the quadratic into two brackets to make (x-3)(x-5)=0 Because the product of these brackets is zero then the value of one of the brackets must equal zero. In order for one of the brackets to have a value of 0, we need to substitute positive 3 or positive 5 into the brackets so that the equation is correct. This means that the graph x2 - 8x + 15 crosses the x axis at the points 3 and 5.
MS
Related Maths GCSE answers
All answers ▸Prove that the difference of the square of two consecutive odd numbers is always a multiple of 8. [OCR GCSE June 2017 Paper 5]
Workout 2 1/7 + 1 1/4
A circular table has a diameter 140 cm. Calculate the area of the table in cm^2, leaving your answer as a multiple of pi.
A bag contains 10 apples. Three of the apples are green and seven of the apples are red. If an apple is pulled from the bag at random, what is the probability that the apple will be green?