If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(3x-5)(7x+5)=90
We move all terms to the left:
(3x-5)(7x+5)-(90)=0
We multiply parentheses ..
(+21x^2+15x-35x-25)-90=0
We get rid of parentheses
21x^2+15x-35x-25-90=0
We add all the numbers together, and all the variables
21x^2-20x-115=0
a = 21; b = -20; c = -115;
Δ = b2-4ac
Δ = -202-4·21·(-115)
Δ = 10060
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{10060}=\sqrt{4*2515}=\sqrt{4}*\sqrt{2515}=2\sqrt{2515}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-2\sqrt{2515}}{2*21}=\frac{20-2\sqrt{2515}}{42} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+2\sqrt{2515}}{2*21}=\frac{20+2\sqrt{2515}}{42} $
| 3(x+4)+2x=5x-2x-2 | | (2x-3)(x-5)=180 | | −2(2x−2)=16−4(3+x) | | 45=5x+253 | | (4x)+5=13 | | x+2x+)+5x+4=53 | | 4/6x^2+10=34 | | 1=t/2-9 | | -24=-6(7v-3)+5v | | 14·y·1=14y | | 10x+4+x=11x−1 | | |0.5x+1.5|=-0.5 | | a–2=-15 | | 1=t/2- | | x-14/3x+24=0 | | (m/6)-4=-3 | | C=15n+450 | | (8x+14)+(12x-50)=80 | | 7x−30=19 | | 3x+12.2=18.5 | | 10-5v=20 | | x^2=3x*4 | | 3x+12.2=18.6 | | C(x)=20x+50 | | 7x+1+10x-32=90 | | x^2=x(x) | | (9x+5)=(12x-19)° | | 10+y/4=18 | | 196=-16t^2+196(0) | | 7(3w+5)/4=6 | | 7x+1+10x-32=180 | | 5(x*17)=$1,495 |