How To Solve x2-7x plus 10 equals 28?

Answer 1

First you need to make it equal 0 by subtracting 28 from the left.

x2-7x-18 = 0

Then you need to factorise it by finding two numbers that add to make -7 and multiply to make -18 and writing it in brackets like this.

(x-9)(x+2) = 0

Then you reverse the signs of the numbers in the brackets to get the two answers (this is a quadratic equation because it has an x2 so it will have two answers).

9 and -2