Question

А)3х² + 13х -10 =0

Б) 2х² -3х = 0

В) 100х² - 16=0

г) х²-16х + 63 = 0

Answer 1

1)x1=-5 x2=2/3

3x^2+15x-2x-10=0

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

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

x+5=0

3x-2=0

x=-5

x=2/3

2)x1=0 x2=3/2

x(2x-3)=0

x=0

2x-3=0

x=0

x=3/2

3)x1=-2/5 x2=2/5

25x^2-4=0

25x^2=4

x=+-2/5

x=-2/5

x=2/5

4)x1=7 x2=9

x^2-7x-9x+63=0

x(x-7)-9(x-7)=0

(x-7)(x-9)=0

x-7=0

x-9=0

x=7

x=9