Question

How to rewrite x^2+18x-40 into factored form

Answer 1

`\text{Here you need to think of two numbers whose difference is 18 and product is}\\\text{40. They are 20 and 2.}\\\\\text{Now we rewrite the given expression as: }\\x^2+(20-2)x-40\\=x^2+20x-2x-40\\=x(x+20)-2(x+20)\\=(x+20)(x-2)\\\\\text{This is the factored form of the given expression.}`