(x+4)(x-7)/2=21

Simple and best practice solution for (x+4)(x-7)/2=21 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for (x+4)(x-7)/2=21 equation: 


x in (-oo:+oo)

((x+4)*(x-7))/2 = 21 // - 21

((x+4)*(x-7))/2-21 = 0

((x+4)*(x-7))/2+(-21*2)/2 = 0

(x+4)*(x-7)-21*2 = 0

x^2-3*x-70 = 0

x^2-3*x-70 = 0

x^2-3*x-70 = 0

DELTA = (-3)^2-(-70*1*4)

DELTA = 289

DELTA > 0

x = (289^(1/2)+3)/(1*2) or x = (3-289^(1/2))/(1*2)

x = 10 or x = -7

(x+7)*(x-10) = 0

((x+7)*(x-10))/2 = 0

((x+7)*(x-10))/2 = 0 // * 2

(x+7)*(x-10) = 0

( x+7 )

x+7 = 0 // - 7

x = -7

( x-10 )

x-10 = 0 // + 10

x = 10

x in { -7, 10 }

See similar equations:

| 6(5+x)=18 | | -2/11+5/22 | | -3.4x=46.24 | | 4-1.35x=0.23x+9 | | 72=4v+4(3v+2) | | x^4+9x^2+4x+12=0 | | 5(8-2x)+7x=-6x+34 | | f(x)=3x^2-6 | | 78=6(x+3)+6x | | -29=5+6[n+4] | | 22+1/2 | | 11+3x=-7(-8x+6) | | 3x-3y=-4 | | log[4](x-7)=7 | | 1/3x+2/5y=2 | | -6+6(x-4)=14x+4-8x | | u/4=u/5+4 | | -5(-4+x)=80 | | f(x)=3x^2+54x+240 | | 10(2x-4)=-12(x+6) | | 6k+5k-10=6k+5 | | -9-8[1-3h]=35 | | 3/5(2x+13)=4(1-3x)+17 | | -18=-8+5v | | F(x)=3x^2-54x-240 | | -3x^2-2x=0 | | x(x-17)=0 | | F(x)=3x^2-54x+240 | | 1+6v=-7+4v | | 9-(2-x)=-x | | 3/5(x+10) | | 8(x-5)+12= |

Equations solver categories