Simple calculation of minus 19 and twenty-four times minus five Please write down the process clearly

Simple calculation of minus 19 and twenty-four times minus five Please write down the process clearly


Original formula = - (19 + 24 / 25) x (- 5)
=19x5+24/25x5
=95+24/5
=99 and 4 / 5



X & # 178; - 2 √ 5x + 2 = 0 reduced to complete square
How many?


x²-2√5x+2=0
Namely
(x-√5)²+2-5=0
So get
(x-√5)²=3
therefore
X - √ 5 = √ 3 or - √ 3
The solution is x = {5 +} 3 or {5 -} 3



Quadratic factorization of one variable X & # 178; + 5x-36


x²+5x-36
=(x+9)(x-4)