Solve by completing the square show work 1)
2)

1. x=5 or -3

Step-by-step explanation:

1. 3x²-6x-45

since all can be divided by 3, u will divide all by three.

the result will be

x²-2x-15=0

x²-5x+3x-15=0

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

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

x+3=0 or x-5=0

x=-3 0r 5.

2. 4x²+24x=-35

4x²+24x+35=0

4x²+10x+14x+35=0

2x(2x+5)+7(2x+5)=0

(2x+7)(2x+5)=0

2x+7=0

x=-7/2

2x+5=0

x=-5/2

there fore x=-7/2 or -5/2

19

step-by-step explanation:

i think it would be 42cm