Complete the square for the quadratic expression x^2 − 8x + 7
As the coefficient (the number before) of x2 is 1 we can start the expression with (x...The coefficient of x is -8 so we half this to complete the brackets and form (x-4)2...Next the square of -4 is subtracted as this will form a remainder when the brackets are expanded (x-4)2-16Finally 7 is added to the expression to form (x-4)2-9
MB
Related Maths GCSE answers
All answers ▸What is standard deviation and how does it work for non-grouped data?
A shop sells only Apples, Bananas and Mangos. The ratio of Apples to Bananas is 5:11. The next shopper will choose one piece of fruit at random. The probability that they buy a Mango is 0.2. What is the probability that they buy an Apple?
Find the area of the rectangle, in cm, with width 4x and length (y+5). Then calculate the area for x = 7 and y = 8.
Expand and simplify (x − 4)(2x + 3y)^2