How do you solve a quadratic equation?
For example x2 - 2x - 35 = 0You would have two approaches to this question. You can either use the quadratic formula or you could simplify the expression. Using the formula you would have x = (2+or- (4-4x1x-35)1/2)/(2x1), giving you x = 7 and x = -5. Similarly you could simplify the expression. The product of the two roots should equal -35 and their sum should equal -2. We can then write x2-2x-35 as (x+5)(x-7), so that we get the answer x =7 and x=-5.
BT
Related Maths GCSE answers
All answers ▸Solve the simultaneous equations: 3x + 4y = 5 and 2x – 3y = 9
You put £800 in a bank account, which earns you 3.5% compound interest per year. How much interest would you have earned after seven years?
Write x^2-4x+9 in the form (x-p)^2+q, where p and q are integers.
There are N counters in a bag, 4 being red and the rest being blue. I take two counters at random from the bag (without replacing the first).The chance i take two blue counters is 1/3, See below in the answer box