Find the interval for which x^2 - 7x + 10 </= 0
Factorise the quadratic by finding two numbers that add to make -7 and multiply to make 10. (i.e. -2 and -5). So x^2 - 7x + 10 = (x - 2)(x - 5) </= 0. Sketch the quadratic to see where it is negative or zero. Find that the interval is 2 </= x </= 5.
LT
Related Maths GCSE answers
All answers ▸How do you solve the following simultaneous equations? 4x-3y=18, 7x+5y=52
In a tennis club, there are twice as many male members as female members. 1/3 of the males wear hats when they play. 1/4 of the females wear hats when they play. 66 members wear hats. How many members does the club have?
The value of a new car is £18,000. The value of the car decreases by 25% in the first year and 12% in each of the next 4 years. Work out the value of the car after 5 years?
AQA GCSE higher specimen paper 1: Question 28