tolong no 1 sama no 5 sja,pke cara nya

8x5 + 12:(-3)
= 40 + (-4)
= 36

1. 8×5+12÷(-3) = 40+(-4) = 36
5.
I. 5x²-10x = 5x(x-2)
= 5x²-10x [bnr]
II. x²-25 = (x-5)(x+5)
= x²+5x-5x-25
= x²-25 [bnr]
III. x²-9x-18 = (x-3)(x+6)
= x²+6x-3x-18
= x²+3x-18 [slh]
IV. 3x²+7x-6 = (3x-2)(x+3)
= 3x²+9x-2x-6
=3x²+7x-6 [bnr]

B. I,II,IV