able to factor use the factors to solve the equations to sol

able to factor, use the factors to solve the equations to solve the equation. 4x^2 - 16x + 15 = 0 10x^2 -21x - 10 = 0 4x^2 - 23x - 6 = 0 3x^2 - 5x - 12 = 0 9x^2 + 18x + 8 = 0 2x^2 + 9x + 9 = 0 8x^2 + 14x - 15 = 0 -2x^2 - 7x + 5 = 0

Solution

2. 4x^2 -16x +15 =0

4x^2-10x -6x +15 =0

2x(2x -5) -3(2x -5) =0

(2x -5)(2x-3)=0

x = 5/2 ; x = 3/2

Sol: x = 3/2 , 5/2

4, 10x^2 -21x -10 =0

10x^2 -25x +4x -10 =0

5x(2x -5) +2(2x -5) =0

(5x +2)(3x -5) =0

x = -2/5 ; x = 5/3

6, 4x^2 -23x -6 =0

4x^2 -24x +x -6 =0

4x(x -6) +1(x-6) =0

(4x +1)(x-6) =0

x = -1/4 ; x=6

8. 3x^2 -5x -12 =0

3x^2 -9x +4x -12 =0

3x(x -3) +4(x -3) =0

(3x +4)(x-3)=0

x = -4/3 ; x = 3