Question

Factor the left side of the equation.
x^2 + x - 20 = 0

Answer 1

you can use headphone method ;)
which is first multiply a times c
then find two number if you multiply them you should get product of ac
and if you add or subtract them you should get middle term which is 1

Answer 2

Here's a hint, what two numbers when multiplied together equal -20 but when added together equal 1??

Answer 3

I have never heard of this "HeadPhone Method" (unless it can go by another name) but would ac = -20x^2? @Nnesha

Answer 4

just the coefficient \[\huge\rm Ax^2+Bx + C =0\]
that is the same method for which we have to find two two number

Answer 5

I am confused now. :(

Answer 6

x is variable
coefficients are A and b number with variables did you understand this part
??
so what a times c = ??

Answer 7

Yes, I understand that part. A times C \(=~-20x^2\)

Answer 8

nope a and c are coefficients

A is one
so one times -20