complete the square by rewriting x^2+6x-15 in the form (x+p)^2-q
To complete the square the first thing you must do is divide the coefficient (number in front) x by 2 to give (x+3)^2We must then expand out (x+3)^2 which can be done by writing it as (x+3)(x+3) then using the foil method to give x^2+6x+9 In order to complete the square we must now subtract 9 from -15 to give -24. The final answer can now be written as (x+3)^2-24
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Related Maths GCSE answers
All answers ▸There are 9 counters in a bag. 7 of the counters are green. 2 of the counters are blue. Ria takes at random two counters from the bag. Work out the probability that Ria takes one counter of each colour. You must show your working.
Using factorization, solve x^2 + 10x + 24 = 0
A perfect sphere of lead has radius 6 cm, and weighs 1710 grams. What is its density? Give your answer in g/cm^3. [Density = mass/volume]
(9-x)/2 = 2x - 8