If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(6x+1)(15x-1)=90
We move all terms to the left:
(6x+1)(15x-1)-(90)=0
We multiply parentheses ..
(+90x^2-6x+15x-1)-90=0
We get rid of parentheses
90x^2-6x+15x-1-90=0
We add all the numbers together, and all the variables
90x^2+9x-91=0
a = 90; b = 9; c = -91;
Δ = b2-4ac
Δ = 92-4·90·(-91)
Δ = 32841
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{32841}=\sqrt{9*3649}=\sqrt{9}*\sqrt{3649}=3\sqrt{3649}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-3\sqrt{3649}}{2*90}=\frac{-9-3\sqrt{3649}}{180} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+3\sqrt{3649}}{2*90}=\frac{-9+3\sqrt{3649}}{180} $
| 5x=3=-3 | | 20x^2+130x+200=0 | | X^4+16x^2+28=0 | | 8(u+76)=48 | | 3(x+7)=-2x-4 | | 9x+13=x+29 | | -5f+19=69 | | 6+i=23i= | | 2(10+9x)=0 | | -15=1-4s | | 5.5=4m | | x−1=−3 | | 1/4=x=5/12 | | -2(z-9)=4 | | 17=4b=1 | | y-18=34 | | -2k+-8=-2 | | 35-h=10h= | | v+26=3v | | x-16=75 | | 3-h=10h= | | z+3/3=3 | | 10=10-3i | | 7b-23=-9 | | x-2=87 | | 23x+3=15x+9+34 | | 8z-12=52 | | -6a-18=36 | | 25=4m-7 | | 4x+41=10x-7 | | 12x-2/3=83/1/3 | | -7(u+4)=-5u-30 |