How do I expand a factorised expression?
Take example (x+3)(x-4) We use FOIL - first, outer, inner, last We multiply each part by the other part. First -> x times x = x2 . Outer -> x times -4 = -4x (remember the minus infront of the 4), Inner -> 3 times x = 3x. Last - -4 times 3 = -12 (again, remember minus infront of the 4) We then add the four answers from FOIL together: x2-4x+3x-12 From here we can simplify: x2-x-12
SK
Related Maths GCSE answers
All answers ▸Expand the brackets? (x+4)(2x-3)
Find x when: (2^x)(e^(3x+1))=10. Give your answer in the form (a + ln(b)) / (c + ln(d)) , where a,b,c,d are integers.
If the area of a rectangle with sides 3cm and (4+x)cm is equal to that of a triangle with base of 2xcm and a height of 4cm, find x
20% of 14,000