factorise: 3x^2+13x-30
(3x-5)(x+6)factors of 90 (3x30): 1x90, 6x15, 9x10, 5x18and add up to 13 can only be 5 and 1818-5=13 5/3 or 18/3=6 and 5x6=30so must be (3x-5)(x+6) and check by expanding with FOIL method
MS
Related Maths GCSE answers
All answers ▸What are the values of x and y?
Do I need to write down all of my working out?
You are given a triangle ABC with sides length AB = 20cm, BC = 100cm and angle A = 70 degrees. Find the angle of C in degrees.
Solve these 2 equations simultaneously: 7x+y=1 and 2x squared - y=3