[factoring trinomials][section 44]

(1.) x² + 7x + 12 here is the problem

= (x + 3)(x + 4) factor

(2.) x² + 6x + 8 here is the problem

= (x + 2)(x + 4) factor

(3.) y² + 8y + 15 here is the problem

= (y + 3)(y + 5) factor

(4.) m² + 10m + 21 here is the problem

= (m + 3)(m + 7) factor

(5.) a² + 3a - 4 here is the problem

= (a + 4)(a - 1) factor

(6.) x² + 3x - 10 here is the problem

= (x + 5)(x - 2) factor

(7.) y² + 7y - 8 here is the problem

= (y + 8)(y - 1) factor

(8.) b² + 2b - 8 here is the problem

= (b + 4)(b - 2) factor

(9.) x² - 5x + 6 here is the problem

= (x - 2)(x - 3) factor

(10.) x² - 6x + 5 here is the problem

= (x - 1)(x - 5) factor