x^2-2x-15 need help ?

x^2 -2x -15

x^2 +3x -5x -15

x ( x+3) -5( x+3)

( x-5) ( x+3) ANSWER

2) 2a^2/3b^5 ANSWER

x² - 2x – 15 = 0

a = 1, b = -2 and c = -15

you can use the

- factoring

- Completing the perfect square root

- Square root

by factoring

(1/a)(ax + P)(ax + Q) = 0

(1/1)(1x + P)(1x + Q) = 0

(x + P)(x + Q) = 0

P + Q = b = -2

PQ = a*c = 1 * -15 = -15

who meet for the P and Q

P = -5 and Q = 3

Because

P+Q = -5 + 3 = -2

PQ = (-5)(3) = -15

Then

(x – 5)(x + 3) = 0

x^2-2x-15?

you probably mean to factor this?

x^2-2x-15

=x^2 - 5x + 3x - 15

= (x+3)*(x-5) ................................... answer

12a^5b/18a^3b^6

you mean to simplify this?

12a^5b/18a^3b^6

= (2 * 6 * a^5 * b) / (3 * 6 * a^3 * b^ 6)

........... strike out the commons for 1

= (2 * 1 * a^2 * 1) / (3 * 1 * 1 * b^5)

............ combine

= 2 a^2 / 3 b^5 .......... answer

1. look up factoring. Once you learn it, here is my answer- -15=-5*3, which when added together equal -2, so it works out by factoring. You can check it by multiplying (x-5) by (x+3) and getting x^2-2x-15.